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Hey Mike: even though the principles are the same for any Whaler, or any boat, if you tell us what your boat is, or even post a shot of her transom, you'll get some more particular advice.

One thing I recall is that some motors wash sideways more than others (with bubbles, I think?). Thus a mounting on the port or starboard side of the motor mattered. This might be based on hull design, not motor, itself.

I think the principle was near to center (to keep the transducer always wet), but not too near to center (to keep any possible interference from the motor away). Always on the transom. And always on a mounting block.

I made my own with marine board (all plastic). I cut it to the size I wanted, rounded over the trailing edges, flamed it with a torch, and glued that sucker on with 3M 5200. I then misted the area with a spray bottle and kept it warm with a light bulb (both because I was doing the install in the winter in my garage).

So no screws into the hull, just glue. Screws go into the mounting board. There are commercially available, pre-made boards. I'm just a DIY jerk. I probably paid as much for my raw board as one of those pre-made boards would have cost me.