I worked on one clients unifi setup and loved it. Immediately got the usg 4 pro, 24 port switch and 3 pro waps. Highly recommend for a prosumer setup.support can be whack, but lots of YouTube and forums. Meraki too pricey for home setup but the support is top tier for critical business.
Yup.iterally only use the modem to convert the signal, then run your own setup off that Ethernet cable.