I normally recommend 2 runs per location minimum. If one fails for whatever reason, like a mouse chewing on a cable, you have a backup.

Running Ethernet to my garage was a big plus also!!! I would like to run Ethernet out for a Doorbell, but that isn’t going to be easy with my house. Ethernet for Smart Doorbells is a growing thing.

PoE Security cameras. You might want some in the future. Running Ethernet for that NOW would be easier than later. You leave a bundle of wire at each area you thing you need a camera and it all goes down the the basement.

How about Speaker wires for a surround sound setup? Maybe Whole Home audio? These are some things to think about with new construction. Ethernet for TV Locations!!! Wired is always better then Wifi.

With your Modem downstairs, how about Wifi Access Points mounted on your ceiling? So you can have great Wifi everywhere you go. This would really help if you want to get into some smart home stuff.

If it was ME, I would replace the radiator. Just for piece of mind and while at it, you’ll have nice new clean coolant. That is good overall also.

If this was Apple, they’d be attacking Google a whole lot more and saying things like Screengate.

I normally say 100Mbps per person. That is enough speed to stream around 4, 4K Netflix streams at once. Or 1 stream and browsing the web and other things at once.

If there are 2 people living there, then 200Mbps. Normally you’d have to go with a 300Mbps plan. Which is more than fast enough for most people.

My Brother and his wife life on top of a mountain basically, and have wireless Internet, and get around 100Mbps. Yet that is enough speed for the both of them to work at home and be on their computers.

If most of your bandwidth is being wasted, why have it? Now there can be reasons why you need more speed. If you do a lot of Peer to Peer and want to transfer a whole lot of large files all the time. Faster speed, won’t take as long as slower speed. Will it make it worth it for you? I doubt it.

All your devices don’t need 50-100Mbps non-stop. They grab a batch of packets and then stop. While some other device is grabbing some packets and then stopping. While other devices aren’t doing anything on the internet.

If you’re doing a lot of waiting around for something to happen on your devices because you’re using so much data, then yes, you need more speed.

My brother works at home in his own office on the main floor. it’s a nice size. His wife works at home and has her own office on the second floor with a really nice view out as they live pretty much on top of a mountain. So I get that. It would be distracting trying to work with the other person in the room, especially in video meetings.

You can NOT spit Ethernet with a 1 into 2 splitter like in your first link!!! On the other hand, the second link with the switch CAN work.

Can you run an Ethernet cable from the main floor to the basement?

So your normal Router has a built-in switch in it. Generally 4 ports. But you can plug that switch into one of the router ports. That turns that 5 port switch into a 4 port switch!!!

Or you can run a cable from the router, down to the basement and plug in that switch and that gives you 4 free ports. You can plug in your 3 devices, but you can use that 4th port for a Wifi Access Point. That would give you great Wifi in the Basement. I don’t know how your basement is. Bully drywalled. Open ceiling? You can mount a AP on the wall or ceiling, or place on a table or shelf. Depending on your needs. Tiy set the SSID and Password for your current Wifi the same on the AP and your phone or whatever will connect to either Wifi from the AP or Wifi from the Router.

You could buy a used AP from ebay. Don’t get something OLD, but something that maybe doesn’t support Wifi 6. I’m trying to be cheap here. They all get their power from PoE (Power over Eithernet) So you need a Injector to power it. A small box with a in port. Plug into the switch, the other port o it is POE, that goes to the AP, and a power cord you plug into a power outlet. It’s pretty simple.

Make sure you know what you are buying. You can go with one of these! I have this one mounted in my garage and you need an Injector. So this one uses this injector. I also have a UK6-Pro mounted in the middle of my house. That uses the $15 Injector as it needs a little more amps. Then you use the Unifi App to setup the AP. You can mount it on the wall. It’ll work a little better mounted on the ceiling. You may have better Wifi than your Wife!

My brother has 3 of the U6-Lites connected to his ASUS router and he has the Wifi turned off on that. His wife works at home. One of his AP’s is also in the garage.

Most home NAS units with an ARM processor would work just fine. I would get a 4 bay NAS as it’s not much money over a 2 bay. I say this because a NAS is not a backup if you don’t have at least 2 copies of the file!!!

Also if the NAS is at their house with their computers and there is a fire or they get robbed and you lose the computers and the NAS, now you have nothing.

You could have a 2 bay at their house and another at your house as a backup. Using rsync for example, you can copy from their NAS to the NAS at your place. Maybe that only happens 1 or 2 days a week. This can be a set it and forget it.

Just because your files are on a NAS doesn’t mean it’s backed up. If a drive fails, you can swap it out and restore all the data onto the new drive. But many other things can happen.

Put a cabinet or dresser or whatever in front of it. Now it’s blocked.

If you have an empty conduit, great, run fiber to each end. You have a switch on eack end with a SFP port on each end which is a 1Gb port. You add a LC module on each switch and connect up. With the switch in the garage, you now have a wired connection there. You can then add a Wifi Access Point, mounted on the ceiling. There are also AP’s that will work outside in the weather. You can mount one of those on the outside of the garage and/or house. APs get power over PoE (Power over Ethernet) So you use an injector for each AP in the garage and outside the garage. Switch to Injector and injector PoE to AP So switch needs power and Injector(s) need power.

Get a Fiber cable from FS.com. Get one long enough to reach each end. You can coil it up at one end the extra length. You can of course go further if you want to have PoE cameras around your garage, inside and out? If so, then it makes more sense to get a PoE Switch with a SFP port. It’s really easier than you think and not as expensive as you would think.

You’re not going to get anywhere near that speed without a wired connection. I don’t know why Xfinity ssells 1.2Gb connections when most home networks are 1Gb, wasting 200Mb os speed.

You don’t really need another router. If you can run a ethernet cable to sa switch. Now yo have wired access to the switch. If you need wifi, yo can get an AP (Wifi Access Point) and plug into the switch. An AP only does Wifi. my 2 AP’s are mounted to the ceiling. But I own my house. You can get an AP that you can mount on the wall or place on a table or shelf.

You could use a router, so long as you can place that router into AP mode. This would disable the routing part the router does but allow you to use the Wifi from it and the built-in switch fro it. Your Normal Home router is a 3 in 1 or 4 in 1 device. It creates your home private Network and routes the traffic. It has built in Wifi, and a built in switch. Could have a built in Modem. I have a Prosumer Router that has no built in Wifi. Which is why I have 2 AP’s.

You don’t want to be double NAT as that will cause problems. Having 2 routers fighting each other. You could instead put the Xfinity cable modem into Bridge mode. That will disable its router and make it a modem only, and then use your own router as a router.