If you have under 10,000 sqft, they round down, so 9 would be your max. Personally, I would do my best to re-home the roosters, so you're not in an unfamiliar place, with 2 weeks to get them off the property, or else. All it takes is one complaint.
You assume it's about the neighbors hearing...
Is there an HOA where you're moving to? If so, they too will have rules, so you might not be able to have the hens either. Are you renting? If so, it's doubtful a renter would allow you to have poultry of any kind. If you're buying a home with no HOA, or deed restrictions, you can have up to...