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

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

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

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.

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

.✅ Thirdly, in regard to objectionable tenancy and nuisance caused by disruptive tenants, you will need to document these violations with undeniable evidence.Because police reports are not usually able to be procured due to disturbances like drug trafficking or domestic violence, you’ll need to take matters into your own hands on producing that documentation.I recommend getting security cameras installed in all common areas and outside your properties.I’ve used SimpliSafe security cameras but you’ll need to install WiFi service at your properties so that you can maintain recordings in the event of violations and add to your lease that any tampering with said cameras constitutes a lease violation as well.This is still developing and once we get further clarity, we will host a round table with legal experts on how to best protect our properties and residents.

But make that police report with the video evidence as the insurance company is going to want a copy.

I think they contain solid information and will help lay a good foundation as a beginner (Haha, I'm completely new to real estate as well, btw)I'm also going to be reading the following books, and hopefully I can finish all by the end of this month:1) The ABCs of Property Management2) The Advanced Guide to Real Estate Investing3) Long-Distance Real Estate Investing How to Buy, Rehab, and Manage Out-of-State Rental Properties (this might be the most important one to me personally)4) The Book on Investing in Real Estate with No (and Low) Money DownIn addition to reading, I'm consuming crazy amounts of youtube videos, and I'recommend you do this as well.

Instead of ring cameras at each door we would angle them down the hallways from the ceiling to get a shot of who is entering and exiting each unit.

His videos are definitions that you can find on Google or the dictionary.