Can the Decklink Mini Monitor show Resolve GUI?

I am planning to purchase a 30" 2560x1600 10bit 16:10 monitor to use for both GUI and main reference monitor. And I may use my other two small monitors as well for GUI.
Does the Decklink Mini Monitor output also the GUI, or just the full screen display? If both, is it easy to toggle back and forth from GUI to full screen? Will I need the 4k version, since my monitor is 2560x1600?
Also can you add more then one Decklink or output to two displays, if I get a 4K reference in the future?
Does the Decklink Mini Monitor output also the GUI, or just the full screen display? If both, is it easy to toggle back and forth from GUI to full screen? Will I need the 4k version, since my monitor is 2560x1600?
Also can you add more then one Decklink or output to two displays, if I get a 4K reference in the future?