After some consideration of the subject of rotational direction, I would think that the right motor/prop would be best to turn counterclockwise and the left turn clockwise. The only benifit would the the torque of the engine ever so slightly counteracting the lateral imbalance of the powered engine versus the non powered engine side if one motor quits. Is this correct? LOL< probably more theory than reality with this way of looking at it.
Denny