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I have a Latitude E5570 and have one USB 3.0 monitor connected which works fine.  I purchased a HP Elite monitor with USB 3.0-c connection, which there are no ports for this connection on the E5570.  I bought a dongle to covert to USB 3.0 and when I plug it in to one of the USB ports in the E5570, it is not detected.  From what I read, I believe I need a Dell E-Port Plus Advanced Port Replicator to have a 3rd display (old monitor, laptop & new monitor).  However, I have two questions in this regards:
Connecting Two external monitors to Latitude E5570