Negative installation I noticed. It is very friemelig to screw the heatsink to the backplane. Otherwise, the installation is simple and straightforward. The clamps hold the fan in place well.
On a pedestal 115x it is recommended that if you do not mind. 20cm long Phillips screwdriver at hand has, unlike in the manual recommended to proceed as follows.
1. Mount Backplane
2. organize a second pair of hands
3. Cool sat and screw without fan on the Board
4. Mount the fan
5. Install the housing board