How do I connect 2 LG UltraFine 4K Displays to a Mac mini?
I'm not sure what adapters to use to connect two displays to a Mac mini. I've purchased a SIIG HDMI to USB-C adapter but it didn't work. Not sure what else to try.
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m1 mini
Video (Monitor):
2 (TB/USB 4), 1 HDMI 2.0 
This model has two Thunderbolt/USB 4 ports and one HDMI 2.0 port. The Thunderbolt 3/USB 4 ports support DisplayPort, Thunderbolt 3 (up to 40 Gbps), and USB 3.1 Generation 2 (up to 10 Gbps).
2018 Intel
4 (Thunderbolt 3/USB-C), 1 HDMI 2.0
Four Thunderbolt 3 ports (USB-C connector, up to 40 Gbps) and one HDMI 2.0 port. These ports also support USB 3.1 (up to 10 Gb/s).
It supports "up to" three displays. It can support either (1) two displays up to 4096x2304 at 60 Hz via Thunderbolt 3 and one display up to 4096x2160 at 60 Hz via HDMI 2.0; OR (2) one display up to 5120x2880 at 60 Hz via Thunderbolt 3 and one display up to 4096x2160 at 60 Hz via HDMI 2.0.
The Thunderbolt 3 ports support native DisplayPort output using USB-C as well as Thunderbolt 2, DVI, and VGA output with adapters. In addition to HDMI, the HDMI 2.0 port supports DVI using an HDMI to DVI adapter. All adapters are sold separately.
Other World Computing sells Thunderbolt docks and external drives compatible with this Mac, I've used them for years and they're very knowledgeable. macsales.com
I dont work for them, I dont get paid for referring them.