Depending on the backlog of getting an elevation certificate in your specific region, you might be delaying your closings by months.
I think your fears are a little unfounded as if there was a loss during the time a tentatively rated policy was in effect, once the proper premium was determined and paid, the insurance policy would be effect at it's face value and would be paid out. So I am a little unsure of your reference to underinsured might be.
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