User Manual Netgear C7000-1AZNAS Nighthawk Cable Modem WiFi Router Combo C7000-Compatible

I guess you could technically lay it on it's side but, it does seems to be designed to be used upright.

Yes, just connect one of the four ports with your switch and you are able to share internet with all connected clients.

No, You still need a company to provide internet. This takes the place of have a modem and router Its both in one.

Check with your internet provider first. I believe you could return it if there were any problems.

You must have a service provider for wifi service. T mobile would require information from this equipment to provide wifi for you.

If you are operating multiple televisions, the line coming off of this modem would go to a splitter. The splitter separates into multiple outputs. Each tv would operate off of one of these outputs.

Your cable providers coax cable has to connect to the modem. From the modem to either your computer or router, you can use Cat 5 or Cat 6 cable.