Surely any prevention steps you take could result in them coming to take the keys or anything else they need to take the car just like you would?
My S3 was stolen by them breaking into the house, whilst it was empty in the afternoon, to get the keys. But whilst talking to a locksmith he said that most car makers can now reduce the number of keys that can be coded through the OBD to 2. So thieves can’t enable an extra key to steal the vehicle. So that would be my first plan of action, plus a house security review.
Then consider either a visual deterrent like a disklok , or a monitored car alarm with tracking and remote immobilisation.


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