[corint]

Depending on your tolerance for bodges, if you get a dock which supports DisplayLink technology (The Dell D6000s does for example), and then install the DisplayLink manager, you can drive 3 external monitors from your Apple M-series laptop.

It's a bodge though, because it creates the extra monitors as 'virtual' monitors, screen records them, and sends the data to the dock. It doesn't play back DRM-protected video for instance. But if you don't need that, it works very well indeed!