Once again, the core piece of this TabletTail package is Octa’s Vacuum Dock, a large black and silver suction cup base made primarily from rubber and hard plastic. Measuring 3.5” in diameter, the cup is too large to attach to any iPod or iPhone, but fits easily on the wider backs of the iPad mini and full-sized iPad. To use it, you’re supposed to attach the suction cup to the back of your iPad, then repeatedly press a silver button…