Maple Leaf Firearms offer similar service and they have a photo of the their cut. Since the M&P non-optic ready slides have rear dovetail sort of pushed forward, I think they can just squeeze an EPS/k footprint in front of it. Other red dot footprints are probably too long to retain the factory rear dovetail.
I wouldn't worry about ejection unless your optic overhangs the ejection port. The RMR glass on my M2.0 9mm Compact does get sooty when compared to other guns. Dot size and color is really personal preference and shooter-dependent. Different shooting styles, speed, environment, eyesight, etc. all play into it. For me, 6MOA is great for anything I plan to shoot up to 50 yards or so. Farther distance is doable with 6MOA, but I have 2.5MOA on range pistols to mess about the 100 yard steel.
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