The Fly6 mount is ridiculously tight, but OTOH you never have to actually remove it. I just undo the rubber straps.

I'm about ready to refit for fall and put the rack back on for the rack trunk bag, and before I do that I need to find a new mount for the Fly6 since seat post clearly won't do. I really only removed the rack and went to a backpack because of the Fly6.

I'm going to try both using a space bar mounted maybe on the seat stays if I can swing it, or the seat tube, though I think there's no way to do that and not hit it with my legs, or I'll be 3D printing a custom mount of some type.

For front cam, if buying new right now I'd probably go with a Drift Stealth 2. I'd switch right now if it had a removeable battery. There are some bad reviews on Amazon regarding spotty QC and horrible support, so I'd buy from a place with a ridiculously good returns history, like Amazon - being sure that Amazon is the seller, not a marketplace vendor, so that I could just return it to Amazon if it was a lemon.

I'm actually kind of thinking about taking a Mobius cam and adding an external 18650 battery which should give several hours of runtime, and 3D printing a case for the whole thing. I think I could make it at least rainproof with an O ring around the protruding lens and keep it around Stealth size.