B-Ski :

No problem with your goal wrt boating. While most people don't use deep structure I do and a good bit. They are just not crib types that work well for small fish in shallow water during warm times. Fish of all sizes use deep structure in cooler waters. The cribs will work in deeper water you just will not get max benefit there.

I was talking about just down the slope and to the right from where you have them in your pic. It looks like a small V ditch and then it gains elevation. About at the end of the shadow of the big trees in your pic. If the water there is 10 ft. then put them about one 5 gal bucket above the bottom that would leave 6 ft of water over the top.