I run Milestone XProtext. It’s not free if you have more than 8 cameras, but it’s rock solid and has the best NVR mobile app I’ve ever seen (the mobile app also supports connections to multiple servers)

Depends on the unit- there is a twist lock 20 amp 120v NEMA plug, but that’s very unlikely to be what’s going on here. You probably need a 30 amp outlet at 240 volts, but be aware of what voltage this specific UPS runs on. If it’s 208, you may not be able to use it at all. If it’s 240, you can get an outlet installed to power it.

I use and love BitWarden. There are paid features, but they’re worth it to support the project. A lot of people on here use VaultWarden, which is a replacement for the BitWarden server that’s compatible with the BitWarden front-end. Be aware VaultWarden doesn’t undergo security audits like BitWarden does.