Right now I have the modem/router in the attic, where most of the computers are, but i also have a computer in the basement, to get to that computer i have a powerline network adapter with two ethernet ports.

However, there is now a laptop that needs to be connected down there and doesn’t have ethernet, wifi range down there is terrible, i’d like to plug something into the additional ethernet that just outputs the same wifi as upstairs (that way i don’t even have to change wifi connections, and it connects automatically to the best one), what would be the best way to do that?