The thing about a GoPro is that if you constantly challenge it to stay in one piece, eventually the odds will accumulate against you and it will fall and hit the ground (see the compilation of videos after the jump).
While a GoPro placed low and getting hit is no issue, having a camera drop a few meter is not healthy for the camera of the people below it.
DIYP reader Joe Romie shoots a lot of volleyball and to get interesting angles he places a GoPro over the stadium mounted on a superclamp and manfrotto arm. Here comes the smart part (although somewhat trivial). Joe's idea for using a GoPro in an impact prone environment is tethering it to the rail with fishing leaders so if it gets hit by the ball, it will not fall all the way to the floor a few meters below.