do you guys think that glass sensor really does a thing when proxy sensor is hooked up? i mean the outter zone proxy would detect the movement and trigger the alarm before someone having a chance to use the duct tape or spring punch to break the window, even though the shock sensor is not triggered. and if the outter zone failed, there's still inner zone to back up. glass sensor is not cheap, if an alarm has already included proxy sensor, do u think that glass sensor is still worth adding?