Not my boat, but... I have had best luck using a bracket made of aluminum and attaching it to one of the bolts/nuts in the pump, versus thru hull glue, which I tried once. the transducer died I was stuck with a dead paperweight glued to the boat.
My boat is Challenger 1800 not the same, but this might work for yours as well.
I removed the ski locker sock and epoxied the transducer to the inside hull.
Ran the wire then replaced the sock. Out of sight. Out of mind. Works great.