Why not just use the stock mounting brackets?
Because of where I'm mounting it I believe I'll get better use of the radiation map/pattern if I have it tilted slightly upwards towards the next floor. I had used heat to bend a piece of plexi I was going to mount it to, but saw this and decided to give it a try.
edit: Still going after a couple of hours, but if it's going to fail I suspect it'll be after 50% height.