Different mounting styles exist for different encoders. Positional feedback is the output of the motor-mounted encoders. When speed and positional accuracy is a requirement, the Absolute Shaft Encoders step up. (Poacht App)

Absolute shaft encoders incorporate their own shaft and bearing assembly, which in turn is coupled to the motor shaft with a belt, gear train or coupling. The encoder may then report shaft angles within a single 360-degree shaft rotation without stops or gaps. (US digital)

BEPC offers both single-turn and multi-turn absolute shaft encoders with a variety of housing sizes, shaft diameters, signal types and resolution. (British Encoder Products Co)