STR have higher incidents of liability insurance claims compared to long term rentals, which is why the premiums are higher and some companies avoid this type of coverage. 

When I was with State Farm there was a $2 million cap aggregate and $2 million per property, so that was $4 million assuming I only had one property incident.

For example, I've had to move a guest before because of a flooding incident in my basement.

@Mark Esposito   sounds like you had that 1 in 10 million incidence and insurance served you well !!

Very good support they can walk you through their systems esp. when you can't get a hold of the installer to remember how to review recordings, which is typically after an incident and police want a copy of the footage.

The standard is an insurance policy with a $2,000,000 per child per incident max. 

@James Wise is correct that it could be difficult to control based on his size and market but I know other property managers with hundreds or thousands of units that have done thousands of self showings without an incident.

If it is anything else I use a $250 deductible per incident.

You are exposed to every incident of life that could happen to that 3rd party  and affect the property. 

Unless I lived in the Nieghborhood and was witness to the incident.