Keypad locks with changeable access codes, cameras over the doors outside side, hooked to a dvr with internet access protects everybody involved.

I had it all recorded on camera. 

Through my W2 employer I've learned how to take 360-degree photos and stitch them together into a virtual tour where you can then go online and "walk" through the house.I'm now trying to decide if it would be worth it to purchase the license for the software and camera for my personal use and begin offering this service to other realtors and investors, and do it for my own properties. 

I think I have hit on a decent business that could employ 1 or two people and still generate a very reasonable return.My thoughts are the renter's would sign a loss and liability wavier and I would provide security cameras and lighting.

Just more Nanny state regulation.

I had a plumber camera the line and it was completely corroded (this was 2 months after I bought it). 

The surrounding apartments had major improvements that maximized the space (larger windows, removing hallways and changing entrance, decks, cameras etc)  and created a very nice space.

A good camera or a new smartphone with a cutting-edge camera may trump the need for a laptop, but if you are seeking a laptop I personally like the Microsoft Surface Book - its lightweight, its got a touchscreen, it got a good battery and decent entry point for a decent machine. 

I feel like installing cameras which I have access to is illegal.

The camera we use is a Garmin Virb which is around $700 and the software is called Transported.