Instead of cups I use these to hold the electric blanket cord off the floor under the bed as the slightest force on it can loosen the contact at the end of the plug. This resulted in a cold blanket and an E indicator (as in Error) on the nightstand panel, which annoyingly is usually not noticed until it's time to slip under the covers. To state the obvious, the detail that keeps the cups from coming off the hooks keeps my duvet cord in each hook attached along the bed rail, freeing up the space under the bed for storage.
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