In Phoenix Arizona the law stated we were allowed a combine total of 25 fowl/rodents (odd).
I had several hundred. I never got in trouble, no one knew. I had an outbuilding in my yard that held my rodents and rabbits, and when it was cool outside, it only held my rodents.
If you breed rodents in your house, or even in an outbuilding on your property, how would anyone know?
*shrug*
I'm not saying to break the law ;-) But, what's the biggest concern you have? Someone walking in and busting you?