LimeHill Wind Spinner for Yard and Garden - Wind Spinner (Blue)

Is the pole on this spinner sturdy enough to be put into ground that is not soft?

Do you have to use the 4prong base stake? I would like to secure this onto my deck instead of in the ground

Is there an adjustment that can be made with the top (blue) pieces so that it spins? Even on windy days this item doesn't spin or move much.

The height say 91 inches, can you make it shorter-- as that is 8.5 feet tall!?