you will need to know the name of the sidescan transducer that is used on the console unit. Then you will look for that transducers listed on the bow unit and select that transducer that is being used on the console unit.
Personally I like the downscan and sonar on the bow. simply because of the speed you need to travel to get good sidescan pics. Sonar will be the best on the trolling motor because it shoots a cone signal down. Sidescan and downscan utilize a thin slice going side to side to make the picture. Kind of like a printer printing one line at a time. When you rotate the trolling motor it will miss a lot of information on the unit.
The sonar will use a cone and it will work great on the front. It would be like looking thru a monocular . you can rotate the scope and the picture will remain the same. Also using the transom transducer on the bow, any waypoints will be off the by the length of your boat.
now I have confused myself....lol