The clamp arm extends straight up as it releases workpiece, then rotates 90° providing easy access for loading and unloading. During clamping, the arm rotates 90° back, then retracts straight ...

I've attached a similar clamp, holding a GoPro, to a car's fender, and driven really, really fast. That should serve as testament to how well the suction cup holds and the durability of the arm ...