This picture shows the true value of the under-cabinet outlet location. Any plug or switch in the middle of this gorgeous mosaic tile would just ruin the pattern and take away from the overall design.
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Tuck the outlets under the cabinets. If it is really important for you to not see any outlets in the backsplash, then consider running a plug strip behind the under-cabinet lights. This removes the unsightly plugs completely.
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Mirrored plate covers make these outlets almost disappear.
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Any good wallpaper hanger should be able to cover a plate cover in the wallcovering so it simply goes away in the pattern.
Power outlets
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