Sorry I’m late replying.
Honestly, I’d avoid combo devices like the plague?
In my experience they have two major problems for users.
More unreliable than two separate devices.
The combo units limit your options to optimize both ISP/WiFi performance in your home.
Number 1 is a big factor for me, if I’m trying to eliminate the unreliable equipment I’ve dealt with from my ISP, why double down and stay in the bad relationship with the unreliable equipment the ISP supplies?
Number 2 can be the more important factor in this decision.
Depending on your ISP, you’re probably being told every time you complain that it’s probably your household coax that’s the issue, and they’d be happy to replace it all for $800-$1200. This can be a cause of issues in some cases, but it’s never worth $1000. It’s almost always the cable between the node and the home that’s been damaged and needs service. And, that’s often like pulling teeth, especially if the node is across the street.
Here’s the thing. Depending on your homes distance from the ISPs node, you could be at the lower limits of what your modem will tolerate without problems. This means that to ensure the best performance and reliability, you really want to keep the coax between the wall and your modem as short as possible. This limits you in how you can place the combo unit to optimize WiFi performance/coverage inside your home?
I’d say get an Arris SB 8200 (Check and make sure it’s a supported model with your ISP), connect it as close to the wall as you can, and run a good quality Cat6 patch cable to where you’ll get the best WiFi performance/coverage from a WiFi6 router? (I’ve had good luck with TP-Link ethernet routers and switches over the years and know two people who have been satisfied with their recent WiFi routers)
Power both with a quality UPS.
Hope this helps.