full-length, Well, if you put the router and cover a bunch of walls is still busy.
Normal people who need speed and normal cover, and without tin foil hat, do so.
Put in each room on the router connect their cable transmitter power by 30-50%, and the same access point name.
And it turns saoeobrazny roaming.
Leaving the room the body is connected to the next point, and so on.
If the router is not the 90s seamless roaming.
So I use already 10 years.
I take a couple of AS2100 that would increase the speed. A network topology roaming naturally leave, for 10 years no problem. And the signal of low level, the cap is not necessary and the neighbors do not connect.
So it is better to think first head than chase the amps and watts in the transmitters.