Fridge Security

Hi all,
I have a trailblaza and autofridge in our camper trailer and was lookimg at trying to upgrade the security for these. At the moment they are chained together and to the trailer via their handles. This is the weak point as the handles can be screwed off or drilled off. I was thinking of something that when the plugs disconnected then a alarm would go off but this became unworkable. What are others doing?
For instance a fridge in an annexe or camp area.

The fridges are portable and expensive with a good secondhand market so they are a hit with theives.

Regards

Mark