Hey Milian,
This IdeaCentre's port selection does not feature a port that supports USB-C dock use, which is why this didn't work for you. To speak to your question, the Tower features one video port at the rear; an HDMI port for output to one monitor. In theory, if you wanted to output to two more external displays, you'd have to use a USB video adapter that doesn't rely on DisplayPort (DP) Alt Mode for video output for it to work with this system.
We hope that this helps, and please feel free to reach out to us with any other questions!
1 day ago
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Lenovo Product Expert