Just upgraded to 5G home wireless and have a NETGEAR Cable Modem CM500 that is compatible with major providers, including Xfinity, Cox, for Plans Up to 400 Mbps, and the iHEYTEK WiFi.
An extender that can run as a standalone router is available.
You get:
NETGEAR Cable Modem DOCSIS 3.0 CM500 w/Ethernet, Power Cord and Coaxial Cables
Set up IP http://192.168.100.1/
iHEYTEK WiFi - Coverage 9500 sq ft and 45 Devices, 1200Mbps 5GHz & 2.4GHz WiFi Repeater Signal Amplifier, 1-Tap Setup Internet Booster with Ethernet Port
Set up IP http://192.168.10.1/