Hi Roy,
Thank you for reaching out to us! I would be happy to answer your questions regarding adding displays to your 2017 Dell Latitude laptop.
Unfortunately, our Plugable UD-3900PDZ Triple Display Docking station requires that the host laptop support USB-C in order to drive three displays. If the dock is adapted to a USB-A connection, the dock will only be partially compatible, where only two out of the three HDMI ports would work and the dock would no longer be able to charge the laptop.
One option for achieving three displays over a USB 3.0 (Type-A) connection is to use a USB 3.0 dual display dock, and then you could connect your third display directly to the HDMI port on the laptop. If you prefer to have all displays connected to the dock, you could add one of our USB 3.0 graphics adapters to drive a third display through the dock. To assist with selecting the appropriate devices, could you please provide the model numbers for the monitors you intend to use?
Thank you!
Ryoma
Plugable Technologies
www.plugable.com/support