What you do is mount the (hand-operated) trolling motor just in front of the rear seat, then put a cooler in front of the rear thwart (which is in front of the rear seat). Then you sit facing the rear and control the trolling by hand, and fish. Believe it or not, you can actually easily stand up (provided you are in a standard aluminum canoe) with the backs of your calves against the rear thwart and fish. I did it for years and never once came close to falling out. If you want to travel a distance, you turn around and sit in the rear seat and turn the motor around so that you go forward.
For all this you need a big deep-cycle trolling motor, which you should wire so that it sits in the bow of the canoe, to act as a ballst, a counter-weight to your weight which is all in the stern.
This is extremely easy to control and there is no need of a rudder whatsoever.