Basically you want it away from motor turbulence or the turbulent areas of the rear of the hull design (not near or on back of chines) If the khz of the unit is a different frequency than your finder you may be able to locate it nearby if the hull design permits. You may also get a plastic or fiberglass mounting board and attach it to the transom and mount your transducers there so you have a greater range of locations and more freedom to move them around for optimal performance.