I have a 2011 Greystone 29MK and the downward facing GFCI electrical outlet under the microwave keeps coming out. It does not have an electrical box, but was installed with the two cover plate screws attaching the cover plate and outlet to the thin (1/8" ?) plywood. One of the screws barely caught the edge of the cutout in the plywood. After a few times of unplugging a cord, the screws stripped out of the plywood. Is there is suppose to be an electrical box that the outlet attaches to and it is missing on my unit?