having a commercial umbrella policy over the LLCS and one for yourself (personal umbrella) or having a personal umbrella with each LLC as name insured on the policy?

is a single member LLC with umbrella insurance sufficient?   

As compared to a regular policy, that is ok with STR, in conjunction with AirBNB/VRBO coverage and my umbrella insurance for liability.  

There's also umbrella insurance.

Since buyers can sue years later for nondisclosure, I’m curious what investors actually do in practice:• LLC structure — one per property or umbrella?

yes I'm currently working with agent under the NACA umbrella

One of my primary focuses is to on-board builders' inventory on our nationwide marketplace so investors can run numbers on properties to see what fits for their needs under the new construction umbrella. 

An LLC with a good umbrella policy basically does the same thing, so I don't see much difference in liability.From a tax perspective, a corporation is double taxed, where you pay a corporate tax and then, when you withdraw the money as the owner, you also will pay taxes on that money.

You want to minimize upfront costs and paperwork while you learn the ropes of being a landlord.However, if you go this route, it is crucial to protect yourself with a strong umbrella insurance policy.

For those using homeowner + landlord + umbrella:• Do you feel this combination adequately covers STR-specific risks?