I have been using 2x wall-mounted industrial mini PCs running Debian to cover 2400 sq two story house. They just work. They have no software that is tricky or unknown. Hell, the one that has a cross connect to the cable modem even run a firewall. Speeds blow consumer routers out of the water. I even have a guest network so the visitors can access internet and not see anything else they are not supposed to have access to. Cost? $300 for both.