Like Reefgeek said, opposite ends point to converge front center, and one across back.
On my 75 had one MJ1200 sort of placed on the back corner second MJ1200 in the other corner, with both pointing about front center (had third PH about some volume dumping back from skimmer). Had good, random turbulent flow though tank with surface agitation.
Might be repeating the myth but consider skipping the timer, hear they're hard on powerheads and anyways, with all PHs running at same time you'll get more overall flow. With them pointing together it will break up the laminar flow.
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