I will be making some stands for my surrounds for my dorm room that I will be entering in a month. I need some suggestions after I explain my situation.

I want to play my sub as loud as possible and I understand that the closer you place the sub to your listening position the lower you have to play it to achieve desirable results. I will be installing shelves on the front wall to place my M22's and I was hoping on putting the stf-2 under one of the shelves, but I was thinking I would be better off if I put it beside the couch which will be against the back wall at only 6 feet from the M22's (remember this is a one bedroom apartment style dormroom). My question is, that because room is so tight, will I be okay if I make one stand approximately half the size of the other one and place it on top of the sub? I'm worried that the small radioshack surround will fall off of the stand because of the vibration. Can you guys give any tips?