How do you know you could have done it for 2/3 of the price? All my internal walls are solid brick, so running a cable from one end to the other would involve d

How do you know you could have done it for 2/3 of the price? All my internal walls are solid brick, so running a cable from one end to the other would involve drilling through at least one, but likely 3 brick walls, and either channeling through the wall or pulling up the hardwood floors above them. No way are you going to install 5 points for €500 in a job like that. Also Ethernet is definitely useful for latency. Having sub 1ms latency on a wifi network is very very difficult, and definitely not going to happen with 5 routers.