Bundled insurance or individual policies per policy?

Hi everyone-

Do you use one company to insure all of your rental properties (e.g., NREIG, SES, Realprotect?) or do you get an individual policy from potentially different, traditional companies for each of your policies (e.g., Farmers for one, People's for another etc.,) 

Are there any advantages or key things to think about when making this decision?

Right now, I have a separate policy for each property as it was cheaper but it is always a bit unclear to me if those policies are designed for investment properties or not.

Really appreciate the help!