So I have a Precision 5510 laptop with Xeon processor, no 4K screen. My question is about this thunderbolt dock TB16. I have one HDMI out and was asked if I can make that work on 3 external monitors. None are 4K. Is that possible? Can it function as extended desktop, not duplicated? And if so, is that 3 external plus laptop? Or is the laptop screen on of the 3?