Martin Audio MLA User Manual page 186

MLA System
USER GUIDE
In this case it is necessary to chance the height and possibly coverage area of the array until a "legal" array shape is produced or
in the case above, reduce the number of cabinets or switch to a two point hang.
The final section shows the mounting option and results;-
The first option for mounting determines how the array is to be deployed Using the Mounting drop-down;-
For MLA there are only two options, flown or ground stacked. Ground stack is only available for an array of six boxes or less, if
the array is larger than six you will see this message;-
MLA System User Guide V2.1
186