I would suggest a mesh system. Especially if you have ethernet available on all floors. I have such a system in a 4 floor concrete house. I have the main wifi router in the basement and an access point on each floor. They all connect together via ethernet back to the wifi router for maximum speed and then that router connects to my provider. I have the same ssid everywhere, the wifi devices seamlessly and transparently switch to the next access point with the strongest signal. So I can go anywhere in the house and have maximum signal. It works great.
I would suggest a mesh system. Especially if you have ethernet available on all floors. I have such a system in a 4 floor concrete house. I have the main wifi router in the basement and an access point on each floor. They all connect together via ethernet back to the wifi router for maximum speed and then that router connects to my provider. I have the same ssid everywhere, the wifi devices seamlessly and transparently switch to the next access point with the strongest signal. So I can go anywhere in the house and have maximum signal. It works great.