HDR is a very new and unwieldy feature. Best practice when you plan on purchasing such a critical component is to contact the manufacturer directly.
That said, it is usually the cable length/type that is the limit and not the particular matrix switcher used. IME- YMMV.
Anyone know the max distance I can achieve for HDR10 if I'm using CAT7 with this matrix, https://bzbexpress.com/AT-OPUS-46M-OPUS-4x6-4K-HDR-HDMI-to-HDBaseT-Matrix-Switcher-by-Atlona.html

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