Lockbox/Camera setup for self tours of vacant units?

[Ben Kirchner]

Does anyone here have a system set up like OpenDoor for allowing potential tenants to view a vacant unit?  Where an electronic lockbox (with ability to remotely change code)  is just left at the door?  I was thinking of having this.  I have some property out of state.  I'm thinking of a way to set this up, instead of having to hire out someone to do the showings.

One thought was to potentially set up a security camera system.  While no items would be in the unit, I would want something in place in case there was any property damage, or unauthorized people in the house.  

If anyone has experience with this, I would like to hear from them.  What lock box do you use, do you use a surveillance system, has this method been successful for you?

Thank you