Definitely a helmet mount provides the least shakey footage, but at the cost of looking like a dork. Selfie stick is no good for regular riding of course.
I like RAM mounted equipment personally, twinned to a gimble but on my motorbike even with the bike suspension sucking up the mostpart of viration you get shakes pretty unavoidable.
For esk8 I’m going to put a mount on an esk8 with a short RAM extension to clear feet & mount it to the rear truck bolts facing forward and offset a little to the side using the 4" extension.
Since I don’t want to pay RAM €45 for a piece of rubber
I’ll make my own like this
If I like it then I’ll print out some cheaper parts to put on any board I want, 3D printed parts and threaded bar for strength
Thinking about it,using flexible filiment for the ball part would give even more shock absorbsion. A real RAM ball is rubber coated metal which is overkill since whatever was mounted would be obliterated already if that were damaged in any way.