As I understand it you can only have two displays on TB3. Two streams as they call it.

It doesn't prevent you putting a DisplayLink type device on your TB3 hub though.

Ref:
What are the video formats supported by Thunderbolt 3? https://thunderbolttechnology.net/tech/faq
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Christian
#40104192 120Gb (no longer in my E36 M3, won't fit the E46 M3)