Insurance quotes for running numbers?

How are y’all getting accurate insurance estimates when running numbers?

I’ve tried looking at software like bright investor but it seems really inaccurate. I’ve also tried getting whole quotes from insurance companies. But then I get tons of calls hounding me afterwards for properties I don’t even own yet.

Is there a way to get an accurate ballpark quote without putting in a full application? I’ve noticed wildly different numbers that have a big impact on my forecasted costs so I think I do need to keep checking insurance numbers.