Looking for Umbrella policy

[Manmath D.]

I’ve a rental property in WV with only landlord’s policy on it. Reading here I realized it’s safe to have umbrella policy, just in case. I had called progressive agent that I’ve landlords policy asking about needing an umbrella policy. But haven’t heard back. Honestly I don’t know anything about what to look for under umbrella policy, how much should I get it and other things ? I plan to have this property till April of 2020 and then put it on market. Take the proceeds from the sale and look for multi.