He sent a message on the platform apologizing and said that he was retaliating against me for presenting camera evidence of him breaking our house rules. 

We want to put up signs and get cameras set up around our perimeter and inside the common areas for added piece of mind for us and the remaining tenants.  

State should install cameras in bathroom stalls and watch what you do while you are inside a public restroom.

They have video cameras. 

You can see the points of entry, window angles and camera locations. see the news link on this topic recently:https://abc7.com/post/blurring-homes-google-maps-thieves-sea...

However, you really only need to have the septic inspected if you are purchasing a mobile that will stay on the property.A septic inspection typically includes a sewer scope, which involves a small camera being fed through the plumbing.

@Pat Aboukhaled wife & I have thought this would be a great use of failing malls for affordable housing.Unfortunately, as @Greg Scott points out, many people take the path of least resistance, which can ruin the idea.So, you'd want security cameras and maybe even security guards to hold residents accountable. 

@Joshua Melero We had vacant property that were remodeling and considered installing cameras inside the property.

For both tenant and landlord peace of mind, the property had an extensive video surveillance and security DVR system already installed by the prior owner, which covers outdoor areas and indoor common areas and records 24/7/365, as well as sensors for excess dB noise levels.

I have put up security cameras out front because of the neighbors.