Just a question.. why are you posting it at all, asking for advice, if the only thing you do is turning that down? it are just suggestions i make, ofcourse you dont need to lissen to that. My point is just... if you keep the cloth behind it, and tighten she screw's.. because of the cloth, the soldered pin's on the back (like PCI and RAM slots etc) might pierce the antistatic bag.
and imo, that something you absolutely dont want.. since the bag's may not be able to charge staticly,.. the cloth certainly is..