please ask the manufactuar
No way, ribtec haven't a clue what a tape measure is. The original offset on rib was nearly 3 inches, way over the top. It should have been 1.5 inches. We have now mounted the engine on the centre line to no ill effect.
What you might notice is that the boat doesn't sit level on the trailer with an offset console. The extra weight from the offset when winching it up caused the boat to lean a little.
Mine is in the middle and doesn't cause any problems.