I saw one guy try a side mount down here on the Wilson, I don't have any personal experience myself but he was pretty out of control and it looked dangerous to me. He got sideways with the motor down stream and it looked kinda iffy there for a while. I have a 10ft. Koffler pram and think if you placed your battery under the operator to balance the boat I can't see a problem mounting the motor on the transom. I toyed with a 5hp. Honda on mine in tide water and didn't like it but it did work.
Randy