Quote from @Jeff Calcaterra: We have a potential tenant new to the area who has gone through a paid background check, signed a background check authorization form, sent us a LinkedIn profile, sent an offer letter and says he is willing to send us paycheck stubs, but says he doesn't want us to call HR to verify employment because he is supposed to have found housing already.

So accepting and approving multiple applicants is the norm?

Every adult must be screened and approved, period.Here's a detailed guide on how to screen applicants: Application Screening Guide

For a purchase generally application would be to review an ID, asset statements, and LLC docs if neccesary. 

If I have a potential tenant that I like then I work with them. 

Are you not necessarily denying him based on screening criteria - Some landlords make it a requirement to view the property prior to letting the applicant apply.

I would not rent to these three applicants. 

Navigating the Surge in Rental Application Fraud: A Guide for Landlords and Property ManagersIn recent years, the rental market has experienced a troubling rise in application fraud.

Piling on...all occupants who are 18 or older (or legal emancipated minor) should absolutely be required to make application. 

The only example I can think of is that I asked an applicant questions about their credit report.