To be clear, there is no fuse in the plug of the philips Hue LED strip, and some low voltage devices (e.g. router, wifi mesh) also don't have a fuse in the socket. This is why I thought of the FCU with the 3a fuse, I am unsure if that change your view on the potential benefit (even if minimal) of a FCU, or not?
Still no need - wallwart PSU's include built-in fuses, and/or current limitation. That, plus the 6amp MCB, provides all the over current protection needed.
