I bought a 3 storey house last year, moved in earlier this year. House was already pre-wired with CAT6 to all main areas including the master bedrooms. Unfortunately the junior rooms were not wired which was very weird, so during renovation I pulled extra CAT6 cables to those rooms. Needless to say, it was a small annoyance but a big convenience at the end.

My routers now mesh with each other using ethernet backhaul on the ground and top floor, so every inch of my house is covered with strong wifi signal (pretty much 5 bars everywhere until outside my front gate).
For one of my junior room which I converted into a media/home theater, all my devices in there is wired up directly to the slave router. This was the best way to get whole home internet connectivity at the lowest cost possible.

Routers I'm using are Asus AX88U, overkill and unnecessary since Wifi6 isn't yet mainstream at this point. You could get by with much cheaper routers.

This post has been edited by SSJBen: Aug 5 2020, 07:40 PM