I am new to the forum and waiting to pick up my new R207 very soon. I did tons and tons of research on transducer location. I ended up contacting Sternmate and had many discussions on placement. I am going to locate mine half way between the inside edge of the starboard trim tab and where the transom steps back. I am also going to install it on the Sternmate. I need to wait until the boat is back and the weather warms up. I will post when I install. Lots of good info about transducer location on the Sternmate site. Check it out.