Yes you can mount it on the stern off to the side of the outboard. If you have a jack plate mounted it will cause some distortion near the surface. You can see it in the images below.
Here is a few images that I have captured. Found these crappie after bass fishing all morning and was headed back to the ramp. Caught a limit on a tube jig in less than a hour.
Here is a school of fish near a fish attractor bouy. You can see the bottom of the bouy and the cable going down.
A tree that was cut and pushed into the edge of the channel when the lake was built in the 1960's This one is from the bow mounted unit.
A old road bed on the left and some tire tracks on the right from when the lake got 20 ft low 2 years ago and someone drove across the mud flat.