Thanks to everyone for the feedback, much appreciated.
Final question. As daisy-chaining from the Cisco switch is ruled out, I have a spare 0.75m AQ Cinnamon cable lying around. Is there a benefit in shortening the NAS-to-switch distance from the current 5.0m AQ cable to this 0.75m one?
Bit of a squeeze round the back of the TV, so the NAS would sit next to the switch and be plugged in the same (bog-standard) mains block. It’s currently on the other side of the room sat on carpet, and the AW cable runs alongside a shielded CAT6 cable carrying broadband from router to the switch.