Didn't know where else to post this.

As you may know, I've been offered a contract job at my workplace. As part of it, I'm in charge of IT. We have two 42" LCD TVs in the waiting rooms, both with Revo machines driving them. I've been working on one and realised there's no security on the hardware ie anyone could have looked behind the TV and nicked it. The TVs are wall mounted on a bracket. The downstairs machine appears to be missing (though I suspect the boss took it home to play with).

I'm concerned that someone could easily walk in and nick something, particularly with so much throughput of public. We already have IP cameras covering the reception/pharmacy/till areas.

I'm after security ideas. I've thought about Kensington locks and UV pen markers but are there any other options I've never thought about?

Something like this?
http://www.red-onions.co.uk/product_info.php?products_id=176663