i got some ideas how you can protect your system
1.turn down music at least a mile from where you live
2.install loud alarm system (really loud)
3.make a secret trunk lock from inside of the trunk , when they will try to open trunk from outside it will not open they will get confused and it will take time to find out about second lock from inside , they will not sit by your car 15 minutes trying to open trunk and specially if alarm is on loud