Thoughts on a modem/router for ultimate service...

So yesterday the installer tried to hook up my brand new, latest Netgear wifi6 router CAX80. I bought it the day before, the power would not stay on. So I had to resort to a Cox modem. Any suggestions on a modem router approved by Cox? I am getting a 280 MPs download speed, but would like something other than Cox. A little gunshot of Netgear, but not a lot of choices out there. I have at least 15 devices. Leaning toward the Netgear C78000. I have the ultimate service. Thoughts??