Umbrella Insurance for rentals and cars

[Mel Park]

Hello, I've got 3 rentals, 1 personal home - and of course, 2 cars.   These assets are spread out between 3 states.    I have $500k personal liability on the rentals and $1mm on personal house.

I'm looking at an umbrella for $3 million - - thus far I've been presented "Markel" .  I really don't know how good a company they are vis a vis paying claims, staying in business etc.  Cursory online search shows less than stellar reviews.

Anyone know a reputable company that can do an umbrella for properties that in in various states....that is a reputable insurer, or is Markel ok?  Thanks