To install Propeller 120 you must use a backplate, shown in Figure 10. First of all, you need to insert the screws on the backplate holes that match your CPU socket. This backplate does not support socket LGA1156, but the manufacturer sells a compatible one.
In Figure 12, you can see the cooler installed on our motherboard, with the fan already in place.
In Figure 13, you can see Propeller 120 installed inside our case.