How about if all turrets would explode powerfully when destroyed the bigger the turret the bigger the boom.
eg. llt and mt explode do about enough damage to kill a raider in a tiny radius (short enough that glaive can kill them without dying.
HLT would have a roach like explosion.
Emp turret would be like a tick.
All the huge turrets tacnuke.
The idea being that porcy forts can be chainsploded if too many turrets are built in a small area.