Echo Dot 3rd Gen Shelf Mount

Made this thing to put an Amazon Echo Dot (3rd Generation) on my old Staples shelf system ("ClosetMaid Shelftrack Elite Bookshelf Kit").

The slots for the shelf are approximately 18.91 mm x 3.25 mm and spaced 6.91 mm apart, so maybe it will fit other shelf systems.

Edit 10/30/19: fixed a random fillet