The receptacles usually are recessed in further than a C4 lighting device. It does look better than a non C4 faceplate but if you want it to look perfect, you need to step out the receptacle using a spacer of some sort. Most electrical supply places will have the plastic spacers that fold up as many times as you need to create the depth you need.
Buy them from where ever you want Hertz. I buy them online from HD because they have the colors in stock and the price is cheaper than any ripoff electrical supplier or distributor. Even Amazon has them cheaper.
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