I am putting a mw drawer under a single wall oven. The mw will be installed in a cabinet at the same height it would be under counter. The 24" wall oven will be just above, so not too high. It's not a perfect scenario, but the alternative was to put it in the island, forcing me to lose my prep sink. Also, the oven is in addition to a 48" range, so will not be used daily.
Here is a photo I found of this setup:
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hood gives staggered look to cabinets
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