I bought a new X4 this year as well. Since there are many great recommendations for Skeeter boat center rigging, I had stopped by there one day to see if they could mount this for me, but we’re pretty far away from great lakes fishing, and I guess they don’t get requests to mount these downrigger S-n-T probes. Their Tech didn’t know what one was. I decided to tackle the project myself, and worked right from the manufacturers instructions. The installation came out great, and the unit works fantastic. I would think you’ll need the transducer down an 1/8 inch or so below the bottom of the boat to get the surface speed wheel working correctly, and to keep the trasnducer out of turbulent water. I mounted mine 4 inches outside of the diameter the prop travels in and an 1/8 inch below the bottom of the boat.