Showing properties from a distance

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I'm looking for info on how others show properties. I am an hour away from my 6 unit and have a vacancy to fill. It is a C class property. I am a systems person and trying to find best way to do this most efficiently that also caters to the instant gratification orld we live in. It's impossible to field hundreds of phone calls and show to each one.

Options: 

Go crazy driving an hour each time someone wants to see it.

Self showing (not sure about that on a c class)

Paying a current resident to let them in (unprofessional to me)

Prequalify and then set up a showing (doesn't weed out liars)

Get application and all documents of proof then set up a showing (seems that demographic doesn't trust that system)

Open houses (If the traffic is anything like the current amount of requests, then not sure I'm interested although it is quite easy to click "is this available" on a facebook post.

Note... Just looking for what others do. No need in bashing any options as I understand all pros and cons of each option. Thanks

[Alex Smith]

A lockbox is a good option. There's also Rently too. You can set the pre-qual questions yourself, and you don't have to deal with the hassle of phone calls and the back and forth that you might currently have to deal with for each showing.