Had one guy (not 3) do the same to me but that was over a yr ago now. Trouble is Cossies still attract a lot of attention, both good & bad.

Apart from the usual Cat1, tracker & Disklock its worth putting the front wheels on full lock so they can't drag the car off the drive so easily. That & get one of these CA2000C Centaur Wheel Clamp. They'll go over 18" alloys so I'm told.

Best of luck mate !!