I’ve successfully used FOG on :
Intel NUC DBN2820FYK
Intel NUC D54250WYB
Programming the BIOS on either is tricky, especially for the first one. I used both in legacy mode.
For the first unit, after PXE boot/deployment, you MUST turn PXE boot OFF in the BIOS if you want it to ever boot properly again.
Even though both were used in Legacy mode, both still had to have the UEFI settings set. Frankly the BIOSes are bafflingly thought out in reverse and quite annoying.