It'll certainly suck up loose fibers from the case. There are foldable stands out there that become very tiny when folded. That's way better than clogging up the vents with dust and fibers.
I have a noname chinese case on the deck, and it's got a but of a lump in the back which clears the intake vent. that helps. i'll only use desktop stuff set up this way, the fan doesn't come on.