With wire shelves, you set the boxes down on the Flexwatt (he needs lids on the boxes). It isn't a lidless rack.

Thus far, I have never had an incident using wires shelves and Flexwatt. You thread the Flexwatt through the wire "spokes". No cover necessary.

And, placing some surface protecting felt "dots" under the boxes eliminates abrasion if that is a concern.
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Mark

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