I know you’re on a budget, but avoid Intel puma based modems. The raw specs look good, they’re the only 8x32 channel docsis 3.0, but they have a big that causes a serious jitter.
https://lookgadgets.com/articles/intel-puma-modems-list/
Personally, I have an Arris S33. The 8200 is good too, those are both docsis 3.1 and more future-ready but $150+. The 8300 you mentioned is an Intel puma, so maybe keep looking. You might be stuck with a 24 channel modem.
Be aware that some only work with neolink in between. I have some B800 cams and the picture is phenomenal, but I have to use neolink and h265.
I moved to Amcrest. Much more open, the api is documented, and h264.
Oh, and frigate NVR