It may be a little high, but it will not hurt the microwave or the fridge.
The Sharp counter top microwave oven in stainless stell, sits flush on your counter top.
Bosch-800-Series-HMB8060-15-CuFt-Builtin-Microwave-Oven-Black, does not get hot externally even after long continuous use and does not affect any other equipment , so there should be no problem in keeping it on top of refrigerator.
Refrigerator, wall oven, stove top, dish washer microwave
Refrigerator, oven and cook top
The Amana Radarange Microwave oven, is designed only for counter top use.
Microwaves should not be leaking from the microwave oven, however leaving food out and not refrigerated can be a health hazard in itself.
You can use a microwave, a stove top, an oven, or a fire to warm food.
The Avanti Counter top Microwave Oven is compact, it would not accommodate large objects due to the compact size.
The GE Profile Counter top Microwave oven does have a continual rotation feature for even cooking.
It is safe for the microwave, freezer and top rack of the dishwasher, but not the stove, oven or grill.
The GE-JEB1860DMBB Counter-top microwave oven has 10 power settings.
Corningware is specifically made to be able to go into the microwave and oven, so yes, you can as long as you are using the glass lid that came with the dish.