The places we've rented use a security deposit, usually $100, and we pay for a cleaner after our use, usually $50-$100. I presume that the cleaner as the home-owner's agent checks for breakage and loss.
Besides, lets face it, if a renter cleans out your place of all the high cost electronics you have a record of their address as well as them being the prime suspect.
If you have to legally disclose hidden cameras I think you can say goodbye to any prospective renters.
Bottom line is, I think, you are being overly concerned and surely your insurance would cover theft with the insurer then going after the likely renter thief.