I’ve looked at a couple of fixed front/rear camera systems, but I’m not keen, in part, because I’d like to have the ability to see to each side, and also when touring for off the bike videos and images, so I’ve bought an Insta360 One RS.
If you’re considering something like this, it works well, though the files are pretty big, but nevertheless I’ve been able to edit on a 2017 MacBook Air without much issue.