Here are pictures of my transducers on my 2013 Z7. The structure scan transducer is mounted up under the first lip. This keeps the transducer tucked away as much as possible to prevent it from hitting objects in the water. This transducer only produces a good picture up to 7-8mph so you will be idling. The skimmer transducer is mounted just to the right on the bottom edge of the boat. The keyword here is skimmer. This transducer needs to mounted so when your boat is on plane, it is skimming across the top of the water. This transducer is a little touchy to get a good picture while on plane. The big thing to remember is to keep transducer level both vertically and horizontally. Also only about half or 1/3 of the transducer will be below the edge of the boat. Once this transducer is mounted, it may take a few tries on the water to get it adjusted correctly. If you are seeing a black picture, that's because the transducer is out of the water while you are on plane and needs to be moved just a little bit.