Rental Property Insurance and umbrella policy

[Mrinal Parashar]

Hello, 

I have been using Allstate for the landlord insurance policies so far, but I reached their limit and cannot get any more policies from them. (Location- Atlanta)

What is the best insurance company for landlord policies?

Another question I have liability coverage in all my landlord policies. Should I also get a separate umbrella policy? 

If I get umbrella policy, should I remove liability coverage from the landlord policies?