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As an alternative opinion, I think 3M 5200 adhesive glue will do more damage to a transom than a few screw holes. If done correctly, the I believe the screw holes are easy to repair if done correctly, and if screws are sealed correctly when transducer is installed, are completely water tight. All transducer brackets have room for adjustment. At least for me, that is the way I do it.

Regarding the Montauk transducer location, I run the line bundled up with all of the engine cabling, then down along side the engine bracket to the transducer. The side of the boat that has the engine cabling determines the side for the transducer for the cleanest installation. In most cases that would be the starboard side, with mechanical steering. In my case, I have BayStar hydraulic, with all cabling on the port side, which is also where the battery and stern light are located. A picture is worth a thousand words.

http://smg.photobucket.com/user/lgolt...1134266582

My Sonar/GPS unit is Lowrance brand.