I have a spare monitor that would be useful for a 3rd monitor, but my laptop only has one display input (HDMI). Do things like this: https://smile.amazon.co.uk/Adapter-Monitor-Converter-Projector-Compatible-Black/dp/B07TC58F34/ref=sr_1_4?dchild=1&keywords=usb+to+hdmi&qid=1587571525&sr=8-4 work? Would I be able to extend it as a third display, or would it just copy one of my other displays?