You can connect cameras like "Blink" to a hotspot or Wifi system.

One more thing I should address:  Installing cameras inside of a residence with other tenants can be a HUGE legal violation.  

Looking for some advice.A prior tenant did some malicious damage to my property.I called police, they attended and the report said they were wearing body worn cameras.

So, you just check the cameras to see if you're having bad weather. 

Squatters break into vacant homes, can present fake leases, and are a valid problem, but if you have cameras on the house, you will be able to get them out right away and you will see them going in.

Communicate expectations upfront—because once they start double-parking or treating the place like a frat house, it’s game over.Cameras, Cameras EverywhereYou’d think adults wouldn’t steal each other’s food, right?

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

All for a sign as long as the property looks occupied...leave shoes near the front door, have exterior lighting, and at least a RING camera. 

Like you said , anyone can check the history,  I do have cameras installed and I do check twice weekly, it's not too far from my primary home . im a first time investor, is it ok to DM the listing to see if I'm missing something?  

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