The wet mount works just as well, it is just a little more difficult to install and if you do it wrong, the water can drain away making the fish finder useless. I am not familiar with your hull design but I doubt that the deep V is an insurmountable problem.
With the wet mount, you have to create a water-tight seal between the well and the hull. Since plastic hulls flex the seal can be easily broken during a rough launch or landing. The well for the grease mount does not have to be waterproof, just enough to hold the transducer in place.
Bob
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