I wanted a mount for my cheap Mobius Actioncam. I drew up this adaptor in Fusion 360, and in the first try, i had a part that fit perfect. It's a snug friction-fit in the hole of the back of the board, and the hole on top can be tapped to the standard 4/20-thread that all camera mounts use.
The bottom hole has no use - i thought of adding an M4 bolt to the bottom to hold down the part, but it wasn't needed.
I mounted my Mobius camera on a cheap chinese "Magic arm"-clone. It works well, but all vibrations from the board goes trough to the camera. Oh well.