COX Cable Modem Question

Unfortunately COX has a monopoly in my area. I have 250Mbps service and routinely get to almost 300 over WIFI.

My streamer and Amazon TV are hardwired into the "Panoramic" modem/router using $35 Pangea cables. I have a Blue jeans 6a cable on the way just to test.  There are only 2 CAT 5 ports.

Is there any benefit to using a dedicated router for the A/V gear (connected to the Cox box) or is what I have set up as good as it will get given the COX router that I have to use?

Any other suggestions?

(I have 4 Ring cameras, a Netgear MESH extender, 2 phones, 2 PCs, and an iPad connected over WIFI)

Thank you.