Mackie posted this pic on their own facebook page a couple days ago. Even they made fun of it.
Well, one other challenge of this setup is that the SRM450s only have AC in. So, they have to run multiple AC lines, which could be avoided if they'd chosen a box with AC loop thrus. Or if Mackie would upgrade their SRM450s to include those loop thrus. I guess they could just put a power strip behind them, connected to those orange extension cords.