Definately don't do all 3.
If my understanding is correct, your MAF probably wont like air being forced in it. I may stand to be corrected, but look at the turbo or s/c setups and you'll note that the MAF is before the air pump.
If you're goin' scoop, go with one in the middle. It looks symmetrical (aesthetics, I know) and you'll vent plenty of ambient air into your engine bay.
