The corner is the best place for a subwoofer. Just be sure your tv is not too close as to cause any distortion from magenitic fields unless your sub is properly shielded.
That sub should work fine in a dorm room. As for the corner placement I agree with Dan. But I wouldn't stuff it in the corner. Maybe pull it away from the 2 walls about a foot or so to keep the bass from being too muddy. Like I just suggested to someone else, you really have to play with placement to find what works best for your room.