No need for the extension lead mate:I was in this situation not too long ago. I wanted to put two cabinets in a cupboard but the rear wall is a stud wall. I took the plasterboard off, fitted some 4x4 batons in place to match the holes in each cabinet, fitted new plasterboard then attached the cabinets through the back and bottom with coach screws. They both passed scrutiny including the heave test.
The cabinets take up pretty much the full width of the cupboard so nobody can get a saw or anything like that in there. The only way they could be removed without opening them would be to smash the wall down from the other side. When I mentioned this to the FEO she said people have been known to go to great lengths to take a safe. I replied that if someone wanted to get in they'd just cut the front off with a battery grinder or, if they had a bit more sense, bring a 9" grinder and an extension lead. It was concluded that either grinder method would be more likely than lugging full cabinets down the stairs and out of the house!
Makita Makita CE002GT201 80V 2x5Ah 355mm BL Power Disc Cutter | ffx
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