Are you standing or seated? Or more directly, there are places to sit at the 100 yard range right? Is that bench deep enough for front and rear rests?
In that picture I am kneeling. There was a folding chair in the range that we used also. From talking to the range officer permanent seating will not be in place until grand opening. To answer your last question it would be tight for front and rear rest.
There were also folks shooting from prone.
That is a bizarre oversight for a seemingly inexpensive fix.

