Not if you have a policy in the county already.  They have never asked me if you had it rented by a certain time or to prove when you actually signed the contract.  IIRC I've taken PP 2 maybe 3 times in the past 20 years, never on everything just isolated fields.  So,,,,, it may not be 'ethical' but I'm sure someone could pull a PP if its been wet and others in the area are claiming PP.