Cooler air charge is about the only benefit from a stockish scoop. In order to get ram air effect the scoop needs to be up in the air stream, a 6 pack scoop is not tall enough from my research. I would seal the cleaner to the underside of the hood.
Here is my solution to seal it. I ordered an 18" aluminum baking pan, cut the center out, riveted the cleaner base to the pan. Added a push-on bulb seal to the rim. Added a Wix 4" tall filter. Better than sucking in hot air.