@ItsJustMe, with the VirbX and VirbXE going to the GoPro style mount the only holdout left is Sony and IONAir. Shimano, all the clones and soon Garmin all use or can use the GoPro style mounting system. Sometimes it pays to be the first, even if it might not be the best. Others that use a standard photographic tripod socket (1/4 x 20) can easily be adapted to GoPro mounting systems.

See the 3D Printed Accessories thread for some printer files for two simplified size-specific GoPro style seat post mounts.