I found the installation to be a bit confusing for me with the variety of options available for installation. I did however really enjoy the thermal grease because of the tiniest bit you needed to use and how easy it was to apply to the CPU. The clip support and backplate were easy to install.
The pictures for both AMD and Intel installations show that the CNPS9300 AT should be installed with the back of the fan facing towards the back of the case to provide an even airflow for the cooler. Depending on which CPU type you're using, in my case Intel, you have a multitude of options, more so for the Intel setup. You can either use a standard clip installation which doesn't use any screws or you can use the bolted clip installation, which I used.
I first tried the standard clip install, but found it difficult because attaching the clip lever to the clip became difficult and finicky to install. I felt that screwing down a bracket seemed to be the more stable install with the faster install time, at least for myself.
The Zalman CNPS9300 AT takes up a lot less space on the motherboard and seems to provide a better airflow than other's we have looked at.
Zalman does have some installation requirements, which I'm sure won't be a problem for most people. Zalman has that listed on the product page under the notices for CPU installation section.