If you are asking about surround, Metro does not do surround panning as of yet so you will have to do it manually by assigning outputs and panning. This is definitely not the easiest way to do surround sound.
I am not directly familiar with z-matrix but it probably will not work very well. Metro currently also has a limitation of two audio inputs to any effects bus. This would effectively limit any surround sound panning plug-in's potential.
If you have a feature request we would be glad to see it in our feature request section of this forum.