I noticed my SSD temperatures were high (70 degrees) and others, with the same case, had the same issue: https://www.reddit.com/r/sffpc/comments/t72zj8/extra_fan_on_a4h2o/
I, therefore, designed a mount for an 80 x 80 x 25 mm fan that fits under the pump of my AIO cooler. I wanted to put it a bit more left, but that would make it incompatible with 25 mm thick fans because of the plastic tap that holds the side panel in place.
The mounting bracket is secured to the case with friction. The fan is only mounted with 3 screws because there is a CPU cooler screw where the 4th would be.
My design fits the ASRock H670M-ITX/ax motherboard with an EK-AIO Basic 240 cooler.
I have uploaded a step file so you can modify it to fit your choice of hardware.
My SSD temperatures are now at most 50 degrees
The author marked this model as their own original creation.