"DIN rail" or Not

[BlackShadowFox]

Well this has been bothering me for a while now. As like many of you we all don't enjoy the new power distribution block for it being big and heavy and not making much sense in our application at certain "POINTS" like when using one atc fuses panel. But anyhow to the question in mind is:

Is there any rules on how to mount the power distribution block?
Such as do we need the DIN rail or could we make our own way?

For people who are confuse about what I'm talking about it is quite simple, i would like to mount the power distribution block in pieces (like black and red) sideways using a different mounting method.

So can you find any problem with this simple mounting change?

Also if you look in the 2007 wiring diagram the 2 atc fuse panels are wired on separate positive wires from the distribution block as for the negative uses one wire why from the PDB. I know ground is common but this wiring diagram is misleading. anyhow don't get cared away on this last part but focus on the mounting topic.