What about a GoPro (or knockoff like the ActiveOn CX) and monitor
it via phone/tablet when needed? You could use a clamp mount to put it where you need, and then remove when you don't, or for charging
. Plus you can also use it for little videos when you aren't using it as a monitor
? Not sure how much time you need to be monitoring all the time, or anything, but it's an option that might not have been considered.
Otherwise, I'm not much help atm since I'm already hiding on here at work