On my 22, a 9.8 short shaft 4 stroke fits the transom and easily clears the Bennett trim tab while it sits close to vertical. However, its depth is short of the bottom of the boat, so suffers a bit when rocking and rolling.
I tried a short shaft 6hp 4 stroke. It was too snug a fit on the transom, and would clear the trim tab, but on max tilt. Not a great angle. I sold it without trying it out.
Note that the larger the motor, the larger the horizontal distance from transom to shaft. The 9.8 is a good fit, the smaller motor, not so.
Brackets etc don't thrill me. Since I want to clamp directly on the transom, best for me would be a long shaft 9.8. I'm looking.