I've heard that having rats and snakes in the same room doesn't work. They snakes smell the rats and get excited. The rats smell the snakes and get scared so they don't breed. I bred both my snakes and rats in the same room without an issue. It was sketchy for about 2-3 weeks while everyone was getting used to the change but after that I didn't have a problem. You should be fine and shouldn't have to worry.