So I came to know that there are actually metal racks that are microwave safe.
This was really surprising! How does it work? Would any similar looking rack work?
You seem to be in need of a lot of microwaving lately!
The thicker the metal the less problems you will have, atoms can bounce around freely inside the rack or in utensils like forks. They just get warm.
Foil can cause sparks because it is so thin and the atoms can break out of the structure more easily.
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Can you think of any more examples of this? Like a thick coin?
I suggest you try it out 
Keep an eye on it though.