Maybe this YouTube video will help.
https://www.youtube.com/watch?v=3IDcAn9-JdQ

I have a T-3 quarter quarter dome. It is easier to set it up, and pick it up and put it over the footprint. With the T-3, the footprint has to be right side up. If it's done this way, any piece of plastic will work. You may be able to get free pieces of Tyvek from Home Depot. They wrap their plywood in it. You don't need grommets. Just make sure the footprint doesn't extend past the edges of the tent or it will channel water under the tent.

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