https://arstechnica.com/gadgets/2022/11/usb-adapter-claims-to-quadruple-m2-and-m1-mac-monitor-support/

Dock-maker Plugable says it has come up with a way to increase the number of external monitors M1- and M2-based Macs support. While Apple says Macs with these chips can support just one to two external monitors, Redmond, Washington-based Plugable's new USB-to-HDMI adapter claims to enable support for as many as four monitors.

According to Apple, the Mac Mini, which has Apple's M1 processor, can support up to two monitors. However, all other M1- and M2-based devices are limited to one external display.