Mac mini & Displays

Are the 27" LG displays 5k? If so, I'm surprised that even two will run.

Mac mini (2018) - Technical Specifications

• "Support for the following combination of maximum concurrent display setups:
• Up to three displays:
  • Two displays with 4096-by-2304 resolution at 60Hz connected via Thunderbolt 3 plus one display with 4096-by-2160 resolution at 60Hz connected via HDMI 2.0
• Up to two displays:
  • One display with 5120-by-2880 resolution at 60Hz connected via Thunderbolt 3 plus one display with 4096-by-2160 resolution at 60Hz connected via HDMI 2.0"

The 2018 Mac Mini supports 3 Displays.

2 Displays on the Thunderbolt ports and 1 Display on the HDMI port.

Connect a display to Mac mini - Apple Support

I connect my Mac Mini to both LG and Acer 27" Monitors (dual monitor setup) via an Alogic USB Docking Station. I also have to switch between my Mac Mini and a Windows Notebook (Windows 11) too. You use DisplayLink drivers. Works fine.