I cannot think of many people I know, would use those balls in the location they are, and trust a mooring ball there with the Break wall 20 feet or so behind you.

I think those balls are a hazard waiting to happen. The crewed charter boats will tell you there is tons of weather in that spot, and a very rolly place most of the time.

Only my opinion. If you use them, dive them and then don't even trust them