Non-Cox modem/router

I am using a Netgear RAXE 300 with good results. If you need more coverage, my suggestion would be to add a TP Link TL-WPA7510 KIT, which will use the ethernet port of your router to extend to the remote unit that I believe has an ethernet port on it, and dual band WiFi, that I have setup with the same ssid/wpa so it acts as a mesh network, with a backhaul to the router using powerline. If you have good power lines in the home, it's an excellent and fast option. If you DON'T have good power lines, then it will be SLOW. It works great for me, and my upstairs tv runs 4K without a hiccup, as does my downstairs tv.