I designed this mount to attach a Runcam 3 that was wearing this TPU sleeve https://www.thingiverse.com/thing:2306842 The mount uses one of the protective lens jut outs to lock the front into place. Then a velcro strap can be wrapped around the underside of the mount, through the legs.
The mount sets the camera at a 20 degree angle.
You can slip the camera in and out of the mount without removing the VTX antenna.
I printed this in PLA at a 60% infill for strength. It has survived a half dozen crashes without issue.