DrewLooking down through your post, if your installing an electronic gate, require an email address so you can send the gate code to them.

At a hotel they use electronic keys which will deactivate after your check out.

Would anyone be able to send me an electronic copy of their assign to contract that you have used with sellers with the plan to wholesale a house, so I can use it as a template to work from?

Ideally the service would accept online or electronic payment. 

  :)(Aside: The Frigidaire is the first fridge I've owned that has had an electronic control board in it.

I had the electronic currency to afford it without financing.

For example you can remind them of the rental due date and then offer to accept rent electronically with a system that allows for AutoPay for example.

You could also acquire a lease from electronic tenant/landlord sites.

Electronic air cleaner. 2 sub pumps.

Basically when people move out we've been replacing deadbolts with the touchpad locks. https://www.homedepot.com/b/Hardware-Door-Hardware-Door-Locks-Electronic-Door-Locks/N-5yc1vZc2bdThen we use passage knobs for the handles so people don't lock themselves out.