If you look at professionally

If you look at professionally recorded pool/billiard games you'll find that seldom is an overhead camera used. Most shots showing the entire table are high and from one end of the table; closeups are often quite low, essentially a point of view shot similar to what the shooter would see. The GoPro is probably not the best choice of cameras as the extrtemely wide angle lens tends to have a "fish-eye" effect under the best of circumstances, essentially build-in distortion.