Not a great pic, but it shows where I mounted a plastic block then a Garmin 'ducer with side imaging on my 260 cuddy. I used 4200 and two mounting screws on the block, and then mounted the 'ducer with the included hardware. My Sham' is a standard rotation prop so I mounted the 'ducer on the port side inward of the exhaust where the prop is moving down to reduce the amount of turbulence flowing past it. I rarely run more than 3000RPM/21kn, and even at that speed the traditional sonar is quite clear. When I slow her down to salmon trolling speed, the SI, the DI and trad. sonar are clear as a bell. With that said, I don't use the SI for salmon due to the depth, but come spring when I am chasing brown trout in 5-6 FOW, it will be very handy. To answer your question, a transom mounted 'ducer mounted on the downswing side of your prop will work very well.