Full scale are the same way. Some light twins rotate so both props descending blade is to the center. This helps when only one is turning, then neither is critical. The P-38 spun them the other way so they could use more power on one enging to help turn tighter, made it a dangerous bird with one out.
I know there is a reason my mind isn't quite grasping right now, but why would the direction of travel make a difference? I would think the only difference would be counter rotating vs same direction...