I mounted mine about 1/4 - 1/2 inch above the bottom edge of the transom on my alum boat. You want the transducer to be in the water on plane. Read the directions with your transducer and mount the starboard so it gives you what you need without being below the edge of the transom. Make sure you let the adhesive set the recommended time. Don't rush it. Good luck and post up pics to show us how it turns out.
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