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I think you could daisy-chain DisplayPort MST monitors, so that only first one would be connected to your laptop.

On windows and Linux this works great. I have two Dell business screens, one with USB-C, a DP in and a DP out. Just connect another screen to the DP out, and you get two screens over one USB-C connection. Together with the charging and USB hub provided by the screen this replaces a docking station for me.

However, Macs have spotty support for this. I believe it works on the newest Mac books, but not older generations, and not the Mac mini?

It doesn't work on Macbooks. References to macbooks supporting MST are about certain early high res monitors that behaved internally as multiple monitors due to bandwidth limitations on Displayport 1.2. That's fixed with higher bandwidth newer DP and HDMI revisions so the MST feature people care about these days is monitor chaining, and that is still not supported even in M2 Macbook Pros

Does anybody know how to test if a monitor is compatible with that? And is it plug and play?

My understanding is that, yes, it’s plug and play. If the monitors have DisplayPort out, they should support daisy chaining.

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