#2 How close to the router does the extender have to be when plugged in?
When setting up the extender, it should be plugged in in close proximity to ensure a solid connection. After completing the setup, you can unplug and move it further away, up to the limits of the useful range of your router. Exact distance will vary depending upon your router itself, plus any obstructions (walls, metal, etc.) and other electronics that may create interference. TP-Link recommends placing the extender roughly half-way between your router and where signal is needed. I was able to link successfully at about 50' away in a commercial building with steel studs. Your results may vary..