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Yes Larry, we need to assume that they have the Standard BIA mounting top holes anyway.

This discussion does not take into account with folks that have Jack Plates.

This info is for standard operators only. Not racers or others with Special Needs like Jack Plates, etc. Most these owners know what they want and what they are doing anyway.

Yes, this is a good starting point as even if someone could measure very accurately, it would still only be a starting point.
Differences in props, how the boat is loaded, and other variables cannot be factored in to this discussion as again, this is a reference starting point.

Next will be the Outrage 18's with single motors. (2 holes up) (NO Jack Plates)

Again, standard applications and standard mounting procedures.
Anyone has something different will have to adjust to what someone else did to their boat. Or maybe what they did?