Did someone remember to tell you to put a bolt through the end of the pole that goes into the concrete?
Or hammer it flat, a bit?
Anything to keep it from turning, later.
As for the mount, do some searching on this forum for home-made adapters to replace the heavy factory mounts.
Puts less load on the motor.
Once you see the ideas, then you can decide what to do (and based on which motor you choose, too).