I clamp mine in the garage and have door and motion alarm sensors + a cctv camera above the door pointing at the entrance of the driveway + electrically immobilised but leave the doors all unlocked. Am I just a tad paranoid!?
One hopes the camera is a deterrent to the opportunist and the wheel clamp a pain in the neck while the alarm is going off waking everyone up. I have considered a smoke generator too (like the Toad alarms of the 90s) for good measure oh and also adding strobe lights for the full disco effect
But if they want your car, they will have it. My next door neighbour had his Defender stolen off the driveway at 22:00 on a Saturday eve. 5 very thick necked / muscled / shaved headed gentlemen walked up to the house with torches and brazenly took care of it calmly for 5-10 mins while their other friends waited in 2 other cars. Now who would be brave enough to challenge them!? :s
Given they closed down our police station and the nearest one is 20 mins away at Vmax, our affluent sleepy Surrey town is regularly being targeted by Croydon gangs as easy pickings according to the Police!