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I understand that you would like to know which Intel® NUC supports PXE boot, Linux OS and Proxmox. I would like to provide more information about this.
First, it is worth mentioning that Intel does not test and validate Intel® NUC on Linux. However, we know that a lot of Intel® NUC owners are using it successfully on many different Linux distros. We recommend you to check your Linux distro's website and forums for peer assistance with this inquiry. You can also refer to these support websites below:
Likewise, we cannot confirm whether Proxmox is supported on Intel® NUC. In this case, the best course of action would be to consult Proxmox documentation to know if other users have successfully run it on Intel® NUC. Also, you should not have any problems booting from the network with PXE on Intel® NUC.
Please find more information about Intel® NUC products below: