OP, the factory alarm does have tilt/shock sensors. It like most alarms are a help but as you know do NOT stop pros. Having had the 1st new car I ever bought stolen 2 months after I bought it I put/buy alarms in all my vehicles. If you go with an aftermarket system it would be nice if it works with your OEM fobs like the factory system or you'll have another item on your key ring.
2012 V6 traded in for a 2017 VW GTI.