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[anthlover]

Agree something should show. Can be older HDMI cables what come in many flavors 1.4, 2, 2.1 etc. Display port cables have less revisions and generally support what you plug in.

You do no mention whether your 2017 has 2 Thunderbolt ports or 4, but I believe it has 4. As I noted lot less variables when using straight Thunderbolt dock or straight Thunderbolt 3/UBC-C to HDMI or Display port cables or Dongles. No Displaylink software required. Everything uses Apple's built in drivers and just works

While I am very happy with the Targus Dock 180 and Displaylink, I bought it for my M1 Mac. I already had Caldigit Mini Thunderbolt dock for my 2017 work15 Inch macbook Pro. I happen now to be using it for both to keep my desk neater, but would never have selected a Displaylink based Doc for a non M1 MAC. At least not without future proofing in mind. Current crop of M1 macs require a displaylink chipset based docking station to support more then 1 external monitor on a M1 pro or air or more then two on a mini. Older non M1 macs natively support 3 external displays.