A good way to do this is have it electronically signed the night before you meet with them to exchange money.

However, do make sure you have some form of electronic confirmation that their payment was received.

I like that they have online electronic signatures and when you have 5-6 students on one lease it makes it more convenient to just email out the lease to each person for signature.  

Do you have both physical and electronic copies of all the necessary paperwork?

Finally, you could consider electronic locks where you change the codes between tenants.

Other states consider the "paid" date to be when the landlord receives the money for electronic payments. 

Go to Etsy and search for "rental property tracker," and you will find hundreds of nice spreadsheets to track 10-20 rentals, usually for under $10.Software has extremely helpful features like online payments, marketing syndication (click a button, and your property is advertised on multiple sites), electronic document review/signing, maintenance tracking, and owner reports.

I suppose it's a lot easier for me to say/do this because I operate 100% electronically, but even if someone only looks at the sheet for a few seconds to answer a question, then I think it's worthwhile to include them.

Heavy duty, old fashioned machines that don't have motherboards or other electronics that tend to burn out.  

I don't think I have the ability to refund any position of the deposit electronically.