I'm not going to lie; installing the Hyper 212 Plus is kind of a pain. First, you have to install the backplate. This requires feeding special screws from the top of the motherboard through to the mounting plate at the proper orientation. Then you tighten the plate to the motherboard using nuts and the provided nut-to-screwdriver cap (Cooler Master historically loves those).
Once the backplate is installed, the cooler can be attached using the given X-shaped mounting bracket. This bracket has notches so that it will only sit in the correct way on the cooler. Tightening the bracket to the backplate requires removing the fan from the cooler.
When the cooler is installed, no part of the mounting system enforces its orientation. The cooler can still be rotated by a few degrees, for example, once installed. It remains unclear to me why they would use such an odd mounting system. At just over 600g, the cooler probably could have just used a standard push-pin system.
Testing just ahead…