And the Apple touchpad doesn't hinge at all! The "click" reaction you get when you press it is simulated by a set of force sensors and an actuator that vibrates the trackpad to simulate a click.
The trackpad on the Magic Keyboard doesn't have a hinge at the back, there's a single button under the center and a lever that runs under the sides which actuates the button and makes the physical click movement: https://www.ifixit.com/News/41291/dang-the-ipad-pro-magic-ke...
