I have to redo some kitchen wiring which is now sharing a single circuit between a refrigerator, a cabinet mount microwave, an in-wall single oven, and some lights.

After separating everything and running new wires to put them all on their own circuits.

The only thing is the microwave, and the in wall oven are located one on top of each other behind the same tall cabinet. I am trying to decide how best to do the receptacle for each.

I can do an individual box for each device.

But is there a reason I cannot do one single handy box, with a duplex receptacle, having the tab broken off, with two circuits feeding the duplex receptacle, other than it might give the appearance that they are being fed from the same circuit without looking closer? Is this code allowed?

 

As long as the breakers are handle tied or 2-pole feeding split receptacles you should be fine.