Either way is fine - as far as I can tell from photos it will not matter - whatever looks nicest.
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Mike (Audiohifila) I'm not surprised that performance was better with grills off. You can ask this question to Mike Lavigne or Jonathan Tinn as they both use the MM3 as their reference speaker.
My guess is they hear the same thing you do. I heard Mikes system this last week, excellent speakers those MM3.