Alembicbassman
Confused.com
I thought the Shimano reflectors were pedal platforms rather than just reflectors? I wouldn't mind a couple of reflectors on the back of my SPD pedals for commuting in the dark, as movement tends to catch the eye.
The SPD reflectors are platforms, but you still have one side free for the cleats.
The SPD-SL reflectors attach via a bracket through the gap in the pedal platform. I had mine come with a pair of R540 road pedals. You can still use the pedal as normal.