However, I am looking for liability insurance/umbrella for the whole flipping business.

And then an umbrella insurance policy will cover liability issues for the property (which is what everyone thinks they need an LLC for). 

We don't have requirements on watering lawns, but if that is important to you or your area, you can include that in the lease.As for liability, I carry liability insurance for all units within our LLC's as well as an umbrella policy for good measure. 

It depends what your risk tolerance is, but I would keep rentals in the same LLC until my equity was north of $1M then put new rentals in another LLC.Another way to reduce your risk is to get liability coverage and a commercial umbrella policy.For taxes:LLC is best for the vast majority of landlords.

Up to 5 or 6 houses you can get a very affordable "umbrella policy" which will cover everything in your life up to several million.

@Evan BellI pay about 3% of gross rents for a standard rental dwelling policy and a $1MM umbrella policy for a 2 unit side by side in Southern California through AAA. 

I have read an LLC can hurt your loan terms is the same true for umbrella policy.

Look at an umbrella policy.