FWIW - My Outlaw 990 (along with all non-Outlaw equipment that I looked at) has a UL logo on the the back.

My Outlaw 750 has a City of Los Angeles Department of Building Safety logo. I assume that since ATI equipment is manufactured in the County of Los Angeles that the LAETL is the closest NRTL.

Finally and not suprisingly my two made in China Outlaw products the RR2150 and LFM-Compact do not show any indication of any agency's approval (note I did not look at the bottom of either unit). I would be willing to bet that the 978 will not contain any approvals either.
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Living Room 24x18 open 1/2 flight up to a raised dining room/hall 24x12
Outlaw 976 pre-pro running 5.1 system
Outlaw 750 for Artison Masterpiece LCR and 2 NHT SuperZeros rears
Velodyne Servo FX-1200
LG OLED65C8PUA via HDMI2 to/from 976 HDMI ARC
Roku Ultra
Samsung BD-D5500 BluRay
Amazon FireStick 4K to 976 Aux HDMI input for Amazon Music Ultra