Took a couple minutes to orient myself to the (ambiguous, in my opinion) directions... Once I sorted that out, I found that the light was a bit too "thick" to fit in the channel it's designed for. As a result of me trying to make it work, the "L" guide broke, and I'm pretty sure there is no way I'll be able to dislodge the unit when it comes time to change the batteries...
Turns out, the light isn't compatible with my safe model, and somehow I missed that when I ordered.
Customer service has been fantastic and responsive, going out of their way to work with me despite this predicament being (mostly!) my fault. Highly recommend this product and company!