A:Answer Definitely ditch the Comcast products. They are often old and outdated, and certainly provide them the opportunity to control your life and speeds like never before.
Also, don't buy that Router. You won't see speeds over 250mb reliably, whether wired or wireless. Bottleneck at the Wan port, and they do not have firmware to fix it. I've tested the device with every setting, and straight at connection. It's the router. Stay away from Netgear. I don't have any problems with the CM1200 cable modem, but their Routers are falsely advertised for distance, speed, and they just don't stay connected. Better off getting an ASUS, TP Link Archer. Belkin and Linksys are always at the low end of my rating scale.
Also, my suggestion is based on speed of service you have. For having 8 or more connected devices, if you don't have a 300mb service plan or better, you'll likely suffer and see the any non wifi 6 router struggle to keep up, especially if somebody is playing ps4 or streaming in 4k.