We want to have a shelf for tags on the homepage, but we want to "rotate" (randomly select) which tag shelf is shown.

There is currently the ability to create arbitrary shelves that would show content from any valid API response that returns add-ons, and in some ways rotating is similar to the primary hero shelf, which shows a randomly selected promoted add-on, but we don't want to have to create 44 shelves, each one defining a different &tag=xxx value.