Hello, We don't currently have a STR, but posting here because many STR use these kinds of devices.   

I would think a detection device would be easy to fool or disable, and difficult to prove in court.I would focus on inspections and look for the following evidence, then document with pictures, written warnings, demands of cleaning/repairs, and follow-up inspections.

Two-factor authentication may also help to prevent unauthorized access to your information.Accessibility: Do you prefer to access your account with a web browser, or do you mostly use a mobile device?

“and a few hundred others we've done at Net Energy in 8 states.”sounds like you’re representing or have a financial interest in a company that sells solar or other energy saving devices.  

I suppose, though, that most people search on phones and the search results are more important on those devices.

You can plug the device into the wall outlet and check the functionality of the wiring.

You'll need to figure out how to wire it (it's not that tricky, a lot of devices have a 12v power supply) or pick a different model that can plug into a wall but has similar specs. 

You could also try privacy mode on your browser or have a friend look it up on their device. 

But in a rooming house, they pay a much lower rent cost, and get the benefit of a professional cleaning crew doing common areas, kitchens and bathrooms, free high-speed Wi-Fi for their streaming devices, etc.

Words a crude device for what goes on in our heads, but they're all we've got!