As part of a wall unit, there's an enclosed shelf area where I'd like to put a new gaming build. The enclosure is 19 W , X 20" deep X 6" high. Sides are solid, but both top and bottom pieces of the enclosure have lots of holes to allow air flow. Is there a case specially made to lay horizontally and have case fans positioned in such a way as to take the best advantage of this enclosure? I'm guessing this would mean fans pulling from below and pushing out the top?