Print two of these brackets if you have a MiniPC with the same aluminum casing profile used by many vendors, similar to the one popularized by Topton, as shown in the picture. Before downloading the model and printing, please measure your casing to ensure compatibility; the total width of the bracket is 137 mm. This design will print easily without support and won't block airflow, thanks to the design I created.

Then, use four regular fan screws to install the two brackets, ensuring a snug fit on the top.

Optionally, you can search for and print a nice 120 mm fan guard/cover to complete the setup.

TL;DR: After installing this custom fan setup on my MiniPC, the CPU temperature dropped by 20°C, and the nVME drives saw a remarkable 25°C decrease in temperature, significantly enhancing performance and reliability.