We could go through a bunch of geometry based on the cone angle of your transducer, the size of your hole, and the depth of the ice to calculate exactly how far in the hole you need to place your transducer each time out. If you want to pack a calculator each time out let me know.
Or...you can just make sure it's in as far as the ice is deep so that the ice doesn't interfere and call it good. Guess which option every single ice fisherman uses.