I think there are arguments for and against, and it depends a lot on how you and Cepheus is planning on explaining your presence, in general. If you're going to acknowledge that you exist, it's probably good for you to be seen around the dorm a bit. That'll deflect casual suspicion more easily, because you're effectively hiding in plain sight, but it puts you under more potential scrutiny. If they're going to try to hide you completely from everyone who doesn't know, the opposite is true.