A r has improvised a solution to have up to six monitors on a single M1 Mac mini, but most users should probably stick to what the unit supports natively.
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Elecife Powerful HDD Hub - Ultimate M1 Mac Mini Accessory – elecife
How the OWC Thunderbolt Hub made my Mac mini setup better - 9to5Mac
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I can't connect 2 monitors to my mac mini m1. : r/macmini
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