Please see the the inverter manual for all of the mounting specifications.
The inverter needs to be mounted at least 20 inches above the floor and 12 inches of space on the other three sides.
Keep in mind that the PV and battery terminals are on the left side of the wire box, whereas the AC terminals are on the right side.This may factor in to where on the wall the inverter needs to be mounted.
The LG Chem battery needs to be mounted at least 24 inches above the floor.
If you plan to have a Solis Autotransformer, it will need to have 14 inches on either side and 16 inches to the floor.
Make sure you have sufficient space on the wall to mount everything you need with the proper spacing requirements.
The critical loads (backup loads) panel can be in another location.