In that setup, the transducer switch is the right way to go.

I have mine on a RAM mount - one thing to pay attention to when mounting it is to leave enough slack in the cables so you can spin it around easily without having the cables bind. I've tried looking at the sideimaging from the bow on occasion, but everything is essentially upside-down and the sides are reversed, so it gets disorienting. It would actually look more accurate to just flip it upside-down - I wish the software had a "reverse view" setting. I have an old Eagle 2D on the trolling motor and I think I'll eventually switch to a Humminbird 700-series 2D or downimaging unit and network them so I can mark my GPS waypoints for cribs, rock piles, etc. from the console then share them to the bow unit. The locations will be off by a few feet, but should put me close enough to find them with the sonar. Was just checking out the XM Weather module - would be pretty cool to see approaching storms on the fishfinder!