The MITO 8M Mini/Nano SOM is designed with two four holes that allow to mount a heatsink directly on the CPU IC.
Suggested part are ATS Push Pin Heat Sinks CPX0250250xx or FPX0250250xx part numbers. See ATS website for more details [https:[MITO 8M Mini SOM/MITO 8M Mini Hardware/www.qats.comElectrical Thermal and Mechanical Features/eShop.aspx?productGroup=0&subGroup=3&q=Push%20PinMechanical specifications|Mito 8M Mini/Nano Board Layout]] section for more details.