After a Bounder touches the ground, it bounces to the nearest enemy available, however, it doesn't consider any terrain changes, elevation differences, bumpers, and portals on its path, which can ruin its locked position.
If bounder lands extremely far away from the target, it may miss. As such, it is best that this weapon be aimed towards your target to minimize the risk of it missing.
Bounder only bounces up ~120 PU, so if there is any terrain between the bounder's landing point and the enemy tank that is ~120 PU or more higher than where the bounder lands, it will hit the terrain instead of the target.