However, they will pay a double deposit and some other fees.

I would give the lender a 1% origination fee and payback the interest on the loan in 2K/monthly payment.

It is common for PMs to stick fees into paragraphs throughout the agreement, this is another red flag.

The difference is just UW fees, better than paying a 20% increase at payoff to remove properties. 

I successfully run 1 STR and have a 2nd that an inherited PM handles.I have Vrbo and Airbnb they will sync with each other with no external software.I set pricing easily by using the built in tools that Vrbo provides.Automated messages are built into both platforms.Vrbo keeps my calendar slammed, but I take direct bookings as needed, simple to do.I have no additional 3rd party fees to very sucessfuly run and manage my property needing only a a few minutes per week.

And when I go camping pulling the trailer I would still be a commercial vehicle .

They can also be a good exit strategy for an investor who used a hard money loan and would like to refinance to pull cash out for their next investment property deal.

My title rep pulled a property profile on the house and it shows as a 2/2. 

Or even interesting to think about the ability to charge late fees. 

If they are charging you an upfront fee, they are more than likely not legitimate.