Regarding operating both microwave and vacuum at the same time.
There is a device called a "Power Sharing Switch" that has two appliances Sharing one circuit breaker. Mine is located under the stairs behind the basement wall.
As for the microwave, I have read of where people have removed the microwave to replace it and found scorch marks on the wall behind it. We replaced ours (died after two years a few days out of warranty). There was no evidence of scorch marks on the wall behind it, however we never used the convection cooking feature. The replacement was microwave only for that reason.
I would suggest for anyone who finds scorch marks on the wall behind the microwave, I would add a piece of sheet metal behind the microwave.
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