I spent 20 minutes Sunday before mounting those four woofers looking for the hex key I had cut down the last time I had to mount woofers.So I went into the stash and found out I was down to my last key in that size so rather than cut it, I used it as-is.
I think the right-angle thing has something to do with findability. Sort of like cutting the hair of Sampson, they get invisible without it.