On my 1976 SPORT 15 boat there were originally no cleats.
A previous owner apparently installed a small cleat on the gunwale tops amidships.

- Fig. 1. Midship cleat added to SPORT 15 by a previous owner. I did not have faith in the strength of the fastening of this cleat to the hull.
- midshipCleat.jpg (23.64 KiB) Viewed 5578 times
The location of that cleat almost amidships was not particularly useful. Also, I did not have much confidence in the strength of the mounting of the cleat to the hull. I removed the pair of cleats and repaired the mounting holes. If I needed a fender amidships, I would just hang it from the railing.
I re-installed the cleats in the stern, mounting them to the inwale, where there was some wood reinforcement embedded in the hull. At the stern quarter the cleats were much more useful. I used them for a mooring line if I were going to temporarily tie to a dock. I also used them to hang a fender over the side to protect the hull. A fender about a foot forward of the transom is a very useful fender when the boat is lying against a pier or dock. I would not use the cleats for mooring if I were going to leave the boat unattended. I would use the stern towing eyes for that situation. The stern towing eyes are strong enough to lift the boat.

- Fig. 2. Cleat on inwale at stern quarter, a much more useful location and a better mounting point for strength.
- sternQuarterCleatOnInwale.jpg (19.09 KiB) Viewed 5578 times