@tantgron Hi, perfect, thank you!
@stefanlitter_1142823 Hi!
I had to use these two:
https://www.printables.com/model/341072-gopro-mount-for-multifunction-arm-mounting-system-
and
https://www.printables.com/model/189555-phone-stand-with-screw-and-gopro-atachment
And some short arms.
Hope it solves it! :) (edited)
@tantgron, Thanks, may I ask which mount you use? I was not able to find it.
Thanks! For my kid on long trips (montage only for the picture)