Whenever I leave my room, I leave the DND sign hanging and the TV on just below nuisance level.
I assume any employee-thief worth his salt will also have access to the in-room safe (as well as a pretty quick in-and-out fast routine).
So my laptop and other electronics that I can't take with me go into the bath tub with the shower curtain pulled closed. Seriously, who would look in the tub for valuables?
(I suppose any thief that reads FT, now).