For me, the holder for the use on MTB was provided. When I tried this last the train to start a bike tour assemble "fast", I needed an extra tool "10er". My colleague had an attachment of GoPro, which no work is done manually. Thus, a quick remounting eg from the handlebar to the seatpost during a tour is not fast. This is indeed the stimulus to film "flexible" from different positions.
Furthermore, the cam always slipping, so you have to align them, the blurred always the film.
The bracket acts like a foreign body, where I can associate myself with the prescribing.
Property me now the bike kit purchased, which goes without tools!