Wellllll - we stay at the WL

. Twice a year, 12 years running. All of the following is personal opinion...
The safes are in your closet. They measure ABOUT, from memory: 12"x5"x3.5" (LxHxD). The lock mechanism protrudes INTO the safe, one edge dimension, about 1". This matters - the depth of the safe varies with length. The inside dimension is LARGER that the door opening dimension. These safes were installed LONG before the advent of laptops or tablets... they are really best suited for cash, passports....
You are NOT going to get a laptop in there. You MIGHT get a smaller tablet in there. I would join others in saying that, at least, at the WL? You are not going to have an issue with any STAFF running off with something. For 12 years, I have left my laptop RIGHT out on the desk

. Never an issue.
Now, I DO do a couple of things....
The laptop is always locked up with a password. Most mouskeepers are not adept hackers

. That thing is worthless if you can't get into it

.
Tablets? We are (first time) taking one.... yup, locked up with a PIN.
Second level security? Just our experience - stuffing it into a drawer will be just fine

.
Third level security: Any data of value? (cc numbers, personal data) PUT IT ON A THUMB DRIVE - then CARRY that thing. Cheap, effective, separates your critical life elements from the MACHINE, which - by the way, is more likely to be stolen by an airline employee

.