I don't think it's OLED. But I thought it was an interesting design that might fit in with an Apple display collection.
SOTSU
https://www.sotsu.com/products/flipaction-elite-16?variant=4...
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For the 6K displays, I'd go with the Asus ProArt 6K - Thunderbolt 4 support.
These Kuycon monitors might be your choice if you want dual HDMI.