[RC-Monster Mike]

Yes, I think it is wise to use the left countersunk screw - the wierd angled molded plastic piece can simply be trimmed with a dremel for clearance. IIRC, the screw is an M5 or M6 with a lock-nut on the bottom side - this will add significant support to the top plate, as the next closest screw holding the top plate own is all the way at the rear of the bulk.

Lehner motors are excellent, though expensive and poorly backed in the service department in my opinion. 4 pole is better in the Baja specifically IMO as well(more torque at startup/smoother startup in sensorless operation and the Baja ha a fairly high rollout).