Since made of wood vs metal/mirror back, I ordered two (one for each sink) and had an electrician wire a GFI linked plug in the back of each. Now electric toothbrushes and other small appliances can be in the cabinet and off the counter. Also, this is a large cabinet, so there is still plenty of room for other items even with the appliance shelf.

Photo shoes cabinets partially built into a shiplap wall. The vanity is yet to be installed, waiting for the floor tile to be laid.