With a group of 5 or 6 KLA arrayed horizontally, it's pattern of 90x90 or 118x90 degrees could be useful, if the stack was elevated well above head height.
The array could be safely ratchet strapped to a large stack of subs, or put on properly secured scaffold deck.
We did that for years with six VRX a side at one of the local 4th of July events here where the only criteria of interest was blasting out fireworks music. We had a delay tower 100 ft out to help with the speeches. Atop 8 ft high scaffold it worked fine. The 5 ft scaff less so.