So place it around 10″ down from ceiling, to the right side of microwave cabinet, don’t place it in center of cabinet because you may have duct work there later. If your ceiling is lower than 96″, place outlet a little higher, the cord on the microwave is plenty long enough.
Where does an over the range microwave plug in?
Install an Outlet Inside the Cabinet Over-the-range microwaves are typically powered by an outlet located within the cabinet above. Shut off your power and install a new receptacle inside the cabinet.