None of them have a dedicated GPU, just a low-powered one built into the CPU. Using a CPU without an integrated GPU would only shave a few dollars off the cost, so I don't that is a common choice.
The weird extreme range (not really Nucs in my view) have a pci slot, seemingly for a large graphics card. They’ll take an SFP card though, and that’s a excellent, though probably the most expensive mini server one could buy.