Federally backed mortgages cannot be called due on sale if it is a transfer to an entity with the same beneficial owners provided that the insurance is properly updated.But this naturally begs the question - if you're adequately insured, which means letting the insurance company know about the entity, that you're operating the property as a rental so appropriate liability limits are written WHY both messing around with the LLC at all?

When getting insurance for your STR's, strongly consider getting the additional $1,000,000 liability umbrella coverage. 

Is this a potential liability with one of the tenants having an injured knee? 

Tax Returns: Request copies of the individual's previous years tax returns will confirm there yearly income and account for expenses and liabilities.4.

My question is, what is the best way to protect myself from liability?

It's not really worth the liability to play police, like you mentioned.It's also going to be hard to create fine lines of promoting(aka the columbus cartel) and outright scamming(Pace Morby-esque stuff) in my opinion.

If someone local has keys, you can try to speak with Latchel contractor to see if they will enter property - then pay them extra to go get the keys.If Latchel contractor won't, due to liability concerns, perhaps you can find a local RE agent that you can pay to accompany the Latchel contractor.Worse case, maybe go back to your PMC and beg them to assist you.

There is also a chance to offset more tax liability by using a cost segregation on the rental property.  

Did you find their offerings to be clean and free of liabilities?

It is important to research tax laws in a particular location before investing to understand the tax liabilities associated with the property.Building CodesBuilding codes specify the minimum standards for building construction and safety.