i THINK Cheata is the maker of the motor mount.. and you can use different motors on them. I know Murrays.com used to sell a motor mount.
They mount on the rear beam. There are permanent and temporary ways to mount them.
I also know someone who uses a trolling motor on the front beam of his H21. With Jib only (and trolling motor) they go from a boat ramp to an island for weekend camping. They raise the main when they remove the gear from the boat.. it works well for them.