That's kinda a bummer. =/
Hm, I wonder if getting a single 4x mount was wise. Putting up 6 1x mounts might be smarter... Cause I can't imagine fitting 2 4x mounts on that thing.
I had two 2x mounts on each shelf, and I was planning on adding a second 2x mount to each shelf. Using 4x mounts is definitely not recommended since there is so much wasted space.
xvart.