I have a Magic Chef MVP III microwave (mfg. 1988) in a home I’ve just moved into, and want to replace it. I can see the three hooks onbottom of the plate that’s attached to the wall that it rests on, but I can’t see anything that is holding up the front of the unit. Nothing on top going thru the floor of the cabinet, nothing on the sides going into it from the cabinets. Any ideas?