The system involves using a simpe viewer (Google Cardboard) which costs anywhere from $12 to $30 along with an app you download on your cellphone.

using a mechanical lock box works great for vendors, but I would never give a code, even a 1 time code with an electronic box or lock, you would be trusting the viewer of the property to turn off lights and actually close the door, I think you are taking a lot of risk this way, I had a vendor that left a door open, fortunately i got there before all the pipes froze, some PEX was frozen when I got there, Just be careful, I would Highly recommend paying a manager, they are worth their fee without question.  

It could help me network while I'm learning to get advice from viewers.

I would also make sure whatever incentive you are offering you post that in the title and not the text, many viewers may skim over it and not notice. 

Most Loopnet viewers aren't looking for triplexes, but for commercial and larger multifamily properties.

I have never seen any rental property with keyless entry on the back patio door, but my tenant is asking for it.This is what I found out when I searched up TX requirement for rental properties-"Every rental unit in Texas should be equipped with the following security devices at the time that the tenant takes possession of the unit:One window latch on each exterior window in the dwelling;A doorknob lock or keyed deadbolt on each exterior door*;A keyless bolting device (i.e. a keyless deadbolt) on each exterior door**;A door viewer on each exterior door;A sliding door pin lock AND either a handle latch or a security bar on each exterior sliding glass door."

On Monday, it was lowered to $250k and the flow of viewers went way up.

Let me know if you have comments on any of this information also https://www.newarknj.gov/viewer/redevelopment-plan...https://www.dropbox.com/s/dcs0vcdn21ww7kh/2018%20N...

My opinion is that the online content is an excellent sales funnel which motivates the viewer to invest with MI and does so very well. 

Average viewer would have said "Oh, that's his agent" but appears they're all in the same office just putting a deal together.