I wanted to solicit some background info before reaching out to my accountant and she advised similar to your comments. 

However, aside from that, I couldn’t find much information about them, and the only online presence seems to be the wife’s LinkedIn profile (though I’ve never met her in person and am just going off her profile picture on Zillow).After submitting the application through Zillow, we attached our income (two months of pay stubs for each of us from our current jobs), work references, credit and criminal background, rental history, and the contact info for our current landlord (who just so happens to be my fiancé’s father).

With your renovation background, you're well-positioned to excel in house flipping.

@Dominic Mazzarella Thank you for the info!

Let me give you some background for context and to help you understand why I am moving in this direction with investing this year. 

I did not do a separate criminal background check as I trusted the info from Zillow (Big lesson learned never to trust the Zillow data again in life).

They e-mail me their background check from the hospital, or I have them complete one through tenantbackgroundcheck.com. 

With your background in real estate (STRs and assisted living), commercial MAY make more sense and then if there are any residential deals you can take them as well.

Quote from @Kathy Tran: @Dominic Mazzarella thanks for your input.

You can decline them off their credit, background and for not having 2 past positive references.