This is a custom designed, 2-part adjustable camera mounting plate for the popular ZMR-250 miniquad. It mounts to the upper plate using the 4 standard anti-vibration rubber balls that came with the ZMR frame, replacing the standard carbon fiber flat mount. The center articulation is completed with a standard M3 screw and nut that you supply-- Nylon screw and nut recommended for lighter weight and better survivability.
Camera angle is easily adjustable in the field depending on your flight style. I use a small velcro patch and strap to secure the camera to the mount, providing a light weight and strong attachment.
There's a more detailed discussion at this post in my blog.