During this period check/verify everything that you want checked/verified.  

Do you verify their income?

Hello folks in Georgia / Atlanta,The Bigger Pockets Book On Rental Property Investing provides access to a comprehensive list of 34 forms that would be useful to a landlord including things like a lease agreement, app...

Our ultimate goal is to locate a property that makes sense from investor's point of view, that has verifiable ARV, accurate estimate of repairs and right price for a buyer to profit from it.

Once you are out, we will inspect to verify there's no physical damage to the rental and refund your deposit immediately.

It's been great as a noise monitor (and I can also see temperature readings which are verifiable and solid).

As @Sebastian Marroquin stated it is important to verify that it is a legal ADU.  

Can you verify that the prior eviction was due to a divorce?

What documents do they require, what credit scores do they allow, how do they verify previous rental history, etc.?

In my experience, you will always have to get a credit check as part of the application process as the lender needs to verify your credit history for anything outside of the norm and to see your credit score.