Keypad locks, a camera doorbell, and a "panic button" ought to be enough to protect against some of the more horrifying things that someone suggested could happen. 

Good lighting, cameras, signs emphasizing the presence of cameras, gated entry.....all good ideas.

Our neighbor caught a burglar because they had cameras.

I have a duplex where the plumbing was getting backed up.Had a plumber go out there and put a camera in the lines and turns out there are roots growing into the plumbing from a nearby tree.The quote to rip out and replace the plumbing was a staggering number.My thought is to cut down the tree to stop the growing and then eventually put the liner in the plumbing.Any experience with this?

I've seen these situations spiral out of control and lead to occupants neglecting/damaging the property, such as making holes in the wall to look for hidden cameras, nailing doors and windows shut, etc.

.- EVERYONE has a camera phone, so there's ZERO exuse for a PMC to not provide before & after pics/videos 90%+ of the time, so you can confirm what you paid for was done and done properly.4) Rent Collection - PMC should communicate when they receive a payment, any NSF, when rent is late, and their ongoing collection/eviction efforts. 5) Lease Renewals - owner should have a say in new rent amount.

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 had camera put in, and plumber could see portions of cast iron and said we should replace everything.

Digital cameras make it easy to take hundreds of photos during each inspection.

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