@Dani U. check out some of the online payment options here as some of these can block partial payments:https://www.biggerpockets.com/rei/pay-rent-online-...Let me know if you have any questions since I am involved with the payment industry, as mentioned, so I am obviously biased toward an online option.  

No issues, and I have the cash to pay off the loan at any time.  

Will you pay a management company or will you self manage?  

Get someone else to pay your mortgage and then some!

And don't worry, the seller pays the commission on the transaction, so you basically can't lose by deciding to work with one.

The prop is being sold through the fed gov and and dont think she has had to pay rent for a while.

How much do I pay them per deal and how can I trust they're running the comps accurately?

@Ewan Tong, you can bring in a buyer's agent if you pay their commission.

Do we pay cash for 4 cheap turn keys out of state?

Of course you could look at lease rates on Loopnet and Commercial Search, but I like the low tech approach of going to an area and walking into a business of a similar property and just asking them to be kind enough and help you with some market research and tell you how much they pay in rent.