A:AnswerI have always used 2 routers 1 for each side of the house. Plenty of videos to learn how. There are to many variables to answer your question. Things like metal studs, radiant floors, and such things all interfere with the distance/range of a wireless router.
A:AnswerI currently have 10 devices. 3 smart TVs 3 laptops and 3 phones pretty much always on and the all do just fine. I should mention I have a 2 bedroom apartment. To get device in the corridor I use a WiFi extender. Gives me a longer range but all my devices run fine