Check out this thread. Idk what trim your Z is but if it's base with the 3 buttons in the center console that aren't being used you can turn it into a cell phone holder. JTM88 posts a blueprint that you can submit to an online website that does 3d printing and they will make it for you for like $20 or something like that. Have it on my Z and it works like a charm.
Great Idea I cam up with