SPD vs SPD-SL - float and pedaling drills

FWIW: I always strongly recommend against the multi release cleats as they can come out at inopportune times with the potential of causing a crash. I do not have any significant slop or play beyond angular float with my SPD cleats and pedals, which I currently use on my gravel bike. I use Look Keo pedals on my road bike and trainer. SPD-SL are very similar, and are in fact Shimano’s version of the Look design which predated the Shimano pedals.