The Helix DI units are very good and no problem using them at the bow. Two suggestions for you. Firstly, the Helix 10 DI G2N is a couple of hundred dollars more than the Helix 9 DI G2N, but, although they are the same physical size, the 10 has a bit larger screen but a much higher pixel count and therefore much better resolution. If it were me, I would spend the extra couple of hundred dollars for the ten inch unit and it is still in your price range. Secondly, for the trolling motor, if you dont unpackage the transom mount transducer that comes in the box (XNT 9 DI T), you can send it back to HB and they will exchange it for the trolling motor transducer (XTM 9 DI 25 T) which has better shielding to help reduce the possibility of interference from the troller.