Is there any other way of doing it without a standoff box? Do they make a different transom adapter with the ears on it?
Yes- it would mount right where your trim rams and/or exhaust tips are. :notam:
The rams have to mount on the same plane as the pivot point on the outdrive (so your steering doesn't change as you trim the boat). Look at the pivot point...and draw a horizontal line.
Also, it looks like the ram would hit your swimstep when you trailer the drive...