I'm not a Lowrance guy but if I'm not mistaken on your unit the side and down is made into the same transducer. So if you want DI you will have to mount it and then you have SI. Yours will have a seperate transducer for 2d. Nothing wrong with having SI on front. Especially if your slow trolling in a straight line. Have seen some pretty good pictures from it like that even though a lot of people say it won't work.