Wahoo, in my installation, the transducer was suspended about an inch above the hull. I am not sure if it makes any difference whether there is contact with the hull or not. All I can say is that what I did seems to work fine.
As for installing near the transom, that would probably be fine except that your FF will be showing you stuff you have already passed over rather than what you are just about to reach. With inexpensive FF like the one I use, it probably does not make much difference as the resolution is not good enough to see much more than the bottom contour and to find bait balls.
Someone with experience using a high-end fish finder could probably be more helpful than I on this subject.
Bob
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