Adding extra modem for ethernet connectivity?

Hello,

So the modem and router is upstairs in the office. I have an extra coax wall outlet that I'm pretty sure it's for internet in the living room.



I'd like ethernet for the TV, PS4 and computer hooked up to the TV. Is it as simple as getting a router or modem with coax?



If so, what would you recommend? Wireless isn't needed on the second one. Just need something with more than 3 ethernet ports









Please help.

Thanks!



I didn't find the right solution from the Internet.



References:

forums.techguy.org/threads/adding-extra-modem-for-ethernet-connectivity.1201526/



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