Hifivv audio 100A protection -help

Has anyone used one of these and how did you wire it up? I have a LLC switch power supply. Link 500W HIFI Amplifier Switch LLC Soft Switch High Power Supply Single DC Output 24V 36V 48V 60V 70V 80V Replace RingCow H133|Amplifier| - AliExpress


Hifivv audio 100A protection High power supply automatic start soft start protection board of High power amp amplifier|Amplifier| - AliExpress


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It IS intended for transformer power supply to control inrush current.
Your SMPS already has the thermistor to limit inrush next to the input terminals.

the picture you post shows how to wire it.
AC input - from supply.
AC output - to load.