I think it was established that sandbags don't give cover to turrets. Has that changed?
Putting traps in front of a turret or otherwise boxing it in some way with walls to prevent LOS from getting a bead on it (this also reduces turret LOS but can prevent snipers from plinking it down) can be effective.
Putting traps in front of a turret or otherwise boxing it in some way with walls to prevent LOS from getting a bead on it (this also reduces turret LOS but can prevent snipers from plinking it down) can be effective.