Thank you for contacting us and I’d be happy to answer your question!
As you know the Mac mini has a limitation of supporting only one additional display through native connection, but thanks to the DisplayLink technology, this limitation can be surpassed.
We have tested a setup with a different DisplayLink-based dock ourselves and show it working here --> https://www.youtube.com/watch?v=gEhoFz6ldSU
Just like on your current setup, you will need the DisplayLink Manager app installed on your Mac mini - the latest 1.2 version is still Intel-built, but it works on the M1 based systems thanks to Apple’s Rosetta 2’s translation. DisplayLink is currently working on updating the app for full universal support.
I hope this helps. For further information on compatibility tests and recommendations, be sure to check out blog posts on our website --> Plugable.com