The little advice that I have seen is “brick walls -> get a bunch of access points” but that doesn’t sit right with me.
Currently we are using a Proximus (our ISP) modem/router in the northwest most far corner or the house and still get weak signal (enough for lower quality videos like Instagram reels) all the way in the southeast corner on the 2nd floor. It goes through 2 brick walls, a concrete floor, and a door and we can still use WiFi 6. Intuitively I would then set up something like an Asus rt-ax58u or a zenwifi XT8 mounted to the staircase wall or in the hallway in the center of the house. I don’t know if that would be strong enough to reach everything we need, but it seems better to me than a router in each corner and blasting channel noise at our neighbors’ houses since in belgium there isn’t much side-garden if any.
4 access points would be chaos of overlapping channels, noise, devices never knowing which access point to connect to and choosing the worse one or WiFi on the phone/laptop completely freezing service until a reconnect, and blasting RF noise all over our neighbors’ houses.
My mother already has thowe problems bad enough with one wireless router + 1 access point. That’s also why she sees 15 networks on a street of 20 houses far apart from each other.
I think that 1 wireless router in the middle of the house would reach every corner, but I wanted to be somewhat sure before I drop 150-200€