The photo is people shooting off a wood deck built on top of stacked conex boxes.
I would expect to shoot off of various barriers like you see in PRS matches. Piles of rocks, tank trap cross things, maybe standing in a truck bed and off the roof of the truck etc, etc there are shooting positions all over the firing line of various sorts for the matches offered there.
The steel targets will be approximately reduced C size or full ipsc target size until you get out to maybe 700 yards and they get bigger. Unless they change the targets for this match.
I would think a bipod and a front bag would be helpful.