When I’ve flown the DJI F450 Arducopter with a GoPro camera mounted on the front ledge I’ve been unhappy that the front arms and props are in the picture.
It would be easy to fix this by mounting the GoPro upside down off of the bottom of the quadcopter. Unfortunately the stock legs don’t leave enough clearence for the camera. Wiffle balls are a simple solution to extend the legs.
Quadcopter with Wiffle Ball legs