I did install the unit per KFS. I used the transducer fixed into a pad of styrofoam, and used some petroleum jelly for contact between the transducer and the hull itself. It works great.
As for my lack of satisfaction with the unit's sensitivity, I specifically find that the unit is overly sensitive, even when I manually set the sensitivity low. I may be able to tweak it here or there some more after extended use and experience with it, but like I said before that feature really isn't that important to me.
Good luck with outfitting your rig.