Seeedstudio has released a new carrier board for the Raspberry Pi Compute Module 4, allowing the device to be used as a mini router. Accordingly, the accessory brings multiple physical connections to the CM4, including dual Gigabit Ethernet and USB Type-C. The Dual Gigabit Carrier Board has a built-in aluminium heatsink too, which should keep the carrier board and CM4 cool under sustained load.
https://www.notebookcheck.net/Raspberry-Pi-Compute-Module-4-New-carrier-board-turns-the-CM4-into-a-mini-router-with-an-aluminium-heatsink.553538.0.html