Assuming properly drilled pilot holes, would installing one on the bottom of a glue-lam provide the full support rating? I'm envisioning the laminations separating as the screw enters the piolt hole, and the threads possibly not engaging the wood around their whole circumference.
Just what are the dimensions of this beam where you are installing the box? If at least as wide as regular 2x lumber I can't see a problem. Even though it's laminated it can be considered as solid as regular lumber so I don't think you are going to have a problem with it separating. It ain't going to come apart.
LK, I don't think what you provided applies here, this really isn't that heavy.
-Hal
