My place is a "no pet" place. But everyone has a dog, cat, or bird. Not kidding and no one really hides the fact that they do. When I moved in I told her I have a few snakes, described how the enclosures had a locking glass door and that I feed F/T. She said fine no big deal. Well they don't know about the rat rack in my room now and they don't need to. They also don't know the number of snakes now and again they don't need to. The maintenance guys only see the two T8s in the living room and no one ever says anything. The rats and other snakes are in my room and they don't have a reason to go in there.
I'd say be upfront to an extend. To the average person 7 snakes (like I have) seems like a lot. You're one should probably be fine. I'd just ask if they allow small caged animals and go from there. I wasn't specific about the number or the species. "Python" tend to get the reaction of 20 food man eater.