@bpratt moving heads have a limit how far down they point anyway, so mounting at an angle might be necessary in your case. MHs can be mounted upside down, so cant see any reason they couldn't be mounted at an angle.
I've been monitoring the thread and the mounting posts made me a bit curious. So, I went searching. The Chauvet Intimidator User Manual says it can be mounted in any position. As would be expected, caveats are proper ventilation, secure mounting, and no physical interference amongst other things. As to the AliExpress spot; a web query of the brand and model led to a dead-end.