Does one device need to be hardwired to the modem/router via Ethernet cable? Is the second device located anywhere, and will it transmit wirelessly to boost signal or must it be hardwired into the computer, tv, console, etc?
It's probably most common to connect one device to the router and then any other devices you add are just as if they were plugged directly into the router as well. You are connecting them up using Ethernet cables which is what networks used before WiFi (and before that, Coax). That's why they come in a pair - your first need two to form a bridge connection but after that you can add additional ones for other devices.
