When a network question comes up in TOTV, you’ll get many different answers with many of them inaccurate.
Your xfinity modem can be placed anywhere where you have an rg6 cable. That can be in the wiring box in the garage, or it can be in any room in the house that has an rg6 black copper cable.
If you think you will be fine with 1 router in your house, then position it in a central open position. But if you want very good coverage for your wifi signal, then you are going to need multiple routers (I use 5 routers) and you have the flexibility of putting the xfinity modem in the wiring cabinet in the garage and the 1st router in the garage next to the modem. Then you can convert or use the cat 5/6 blue wires to hardwire your next router(s) in your house, or use the mesh network backhaul when using the newer wifi 6e or newer mesh routers. I converted all my blue cat 5/6!wires from phone to Ethernet cables and use them to hardware the internal network when I can, and use the mesh backhaul network when I can’t wire. I did all the design and installation myself. I also use 3 1G 5-8 port switches throughout the house.
No isp or geek squad person knows how to setup an internal network in your house. Never use a WAP or extender, they are junk. Design a network using mesh technology and you will be fine
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