I have fished out of canoes for about 30 years, I wouldn't bother with a motor of any type. The beauty of having a canoe is it's simplicity....all you need is the canoe and a paddle. Weighing it down with a 12v battery and lugging that around , plus having an electric to carry, is a drag....plus, you can go plenty fast with a paddle. I've used an electric motor in a punt before and it was more trouble lugging it around than it was worth....and if the wind picks up, to me, you are always better off with a paddle.... not to mention the less time you spend with a motor the better your paddling skills will be. It's easy enough to get a rod holder mounted so hands free trolling is a snap.
But, thats just me. Regardless of what you end up going with, have fun