plasma cannons/machine gun turrets work well for pushing the ball about they move it a fair way and slow the players down but you would need 0% damage and a map a bit bigger than this not a complaint just a suggestion- trip mines and spikes are good too
Sorry if you were confused, but the turrets aren't used for moving the ball what so ever. The turrets are only in the game because they block the teleporters allowing the team to score a point. If you have ever played TNT Polo it is basically the same premise.