+1 for the TP-link, I've got one running fiber to my AV equipment :)
It was a lot easier to run a pair of fiber-optic cables there than it would've been to do the same with cat6. Also I got to play around with fiber for the first time.
Never thought of isolating my modem from the rest of my gear though, I need to look into that.
Something as simple and cheap as this would do:
https://www.tp-link.com/us/business-networking/accessory/mc2...