Amazon.com: OREI UltraHD 4K @ 60 Hz 1 X 2 HDMI Splitter 1 in 2 Out 2 Port 2: 8-Bit - HDMI 2.0, HDCP 2.0, 18 Gbps, EDID, Duplicate / Mirror 4K Screens - UHDS-102 : Electronics
Amazon.com: USB C to HDMI 2.0 Adapter – 4K 60hz HDR – 2K 144hz – 1080P 240hz – 6ft Cable – for Monitors, TVs, PCs, MacBooks, Projectors – Thunderbolt Compatible : Electronics
HDMI 2.1 benefits in a 1440p monitor? : r/Monitors
Amazon.com: Belkin HDMI to DisplayPort Adapter, DP 1.2 to HDMI 2.0 Converter for 4K 60 hz Monitor with HDR 10, HDCP 2.2 Compatible, and Uni Directional : Electronics