I might try the “emergency service” which is $20 with limited data and just use that for the smart locks and ring cameras.

Install cameras around the parameter of the property today; post no trespass signs; change your for rent listing. 

I currently have cameras, but they don’t give audio.  

It's a 3 bedroom house and we plan to use technology such as a smart lock, WIFI exterior cameras, and a smart thermostat.

She said she had to think about something sad to calm herself down so the camera would accept her face. 

Or buy a thermal camera to check for heat losses, they have gotten really cheap. 

The downstairs tenant has cameras in his unit and said he has some stuff on there. - the alleged loud tenant is month to month until 12/31.

Yes, i have ring cameras etc.Excellent suggestions. 

@Matt Wan Many lenders require wet signatures on at least the Promissory Note but if yours does not, as a US citizen you could do the entire signing anywhere on the planet with a good internet connection + mic + camera via Remote Online Notarization (RON) for less than $200.If wet signatures are required, the answer then depends upon what foreign country you are in.

I think it's illegal to have indoor cameras.