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It is a very tight fit and a high quality print. Better grip on it than the decent stock exposure mount. As a comparison I sometimes run the stock mount and light inverted on other bikes and it hasn't fallen off either.
~20,000km over the past couple years with the skunkworks and it hasn't come out once.
On the sirus light, I did do a 600km audax with it as my only light in 2019 without issue. Plenty visible.
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https://www.racewaredirect.co/shop/exposure-gopro-mount-with-security-tabs/
This mount uses the original Exposure band to secure it under a garmin/wahoo mount. So you clip the light in and then add the band as extra security.
I have a very high quality 3D printed one from Skunkworks Bikes in Oz. It attaches to the bottom of my K-edge mount
https://www.instagram.com/p/B3bHTgTAWnl/