MacBooks with an Apple M1 processor can handle only one external monitor, but the OWC USB-C Dual HDMI 4K Display Adapter with DisplayLink doubles the number.
i-tec USB C Dual 4K HDMI Video Adapter Works with Mac [macOS, MacBook Pro](1x 4K) and Windows/Linux/Ubuntu (2X 4K) USB C to Dual HDMI Monitor, DisplayLink, MacOS Extend Mode HDMI Converter
OWC Adapter USB-C to Dual HDMI 4K Display Adapt w. DisplayLink f. M1 Mac, Mac/PC w.USB-C/Thunderbolt
OWC USB-C Dual HDMI 4K Display Adapter
OWC USB-C Dual HDMI 4K Display Adapter with DisplayLink
OWC USB-C Dual HDMI 4K Display Adapter
OWC USB-C to DUAL 4K HDMI 視訊轉接器開箱/ 雙4K60Hz 螢幕一線擴充
OWC Adapter USB-C to Dual HDMI 4K Display Adapt w. DisplayLink f. M1 Mac, Mac/PC w.USB-C/Thunderbolt
OWC USB-C to Dual HDMI 4K Display Adapter with DISPLAYLINK for Apple M1 Mac or Any Mac or PC with USB-C or Thunderbolt : Electronics
USB-C to Dual HDMI 4K Display Adapter with DisplayLink for Apple Silicon M1 and M2 Macs
OWC USB-C Dual HDMI 4K Display Adapter with DisplayLink