You can put the Xfinity gateway in “bridge mode” and connect it to a different router
We need more info. Why do you think you need a router?
Almost all home routers are really just switches, and you can run them in switch mode. What you want to do is fine as long as the run isn’t too long. 100 meters is the max
Where are you looking? This community is totally full of these reposts from reddit, posted from alien.top.