The Intel Unite pages state that an Intel vPro-enabled processor is required. None of the NUC kits you listed are Intel vPro-enabled, so none of them can support Intel Unite. The only NUC products that support Intel Unite are the NUC5i5MYHE kit and the NUC5i5MYBE board.
This message was posted on behalf of Intel Corporation
Scott is right; the hub needs to be a system based on Intel® vPro™ technology. Check more details about system requirements over here; Components and System Requirements for the Intel Unite® app.