If it is vagrant or owner occupied, standard evictions should work.If the prior owner plans to redeem, I may still go after the property just to get that 25%-50% interest on my money.

It is difficult to tell how new or seasoned the loan is and how the loan was performing prior to your purchase.  

I can tell you I would never accept our contingencies from another buyer which include: - Due diligence starts at receipt of bank approval letter- Earnest money due within 7-10 days of receipt of bank approval letter- EM held by our attorney who also must close the transaction (difficult when another attorney is handling the short negotiations but there are ways to structure it where they still get paid and our attorney closes it)- Property is vacant at least 24 hours prior to closingThese contingencies help protect our earnest money in the event values during the time it takes to get approval.  

You just make "no prior evictions" part of your rental criteria.

Not to mention to living up to leases the prior owner may have made with a tenant.  

I even had an appraiser once note in a report the sellers purchase price two years prior and the excessive profit sought in the asking price.

On a prior call with sales dept, I think they mentioned yardi and a bunch of ones I had never heard of, and I am familiar with the top tier ones geared to single family houses. 

Also I have started doing annual inspections of a property, prior to the renewal of the lease...

We frequently request payment prior to filling in and sending the lease, especially if it's over PayPal or by Credit Card - these are all safe transactions for everyone involved. 

Basically my concern is, should I be concerned with trying to make this purchase prior to getting married in order to utilize the FHA option?