When Glamer Spinners enters the battlefield, you target only one permanent: the one that will be losing its Auras. You don't choose the permanent that will be receiving the Auras until the ability resolves.

You may target a permanent that has no Auras enchanting it.

When the ability resolves, you choose the permanent that will be receiving the Auras. It can't be the targeted permanent, it must have the same controller as the targeted permanent, and it must be able to be enchanted by all the Auras attached to the targeted permanent. If you can't choose a permanent that meets all those criteria, the Auras won't move.