From what I remember most of the transducers intended for a transom mount now will work fine as a shoot through. Just purchase their epoxy.
Read up on some of the stuff, ideally you want to contact the bottom as flat as possible, with no voids and just a little forward to get away from engine noise. Usually you can adjust the sensitivity to overcome any slight problems.
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'75 Cuddy with '00 Johnson Ocean Pro 150 horse
Benny
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