Ironfoot, anything is possible when shooting metal targets.
We had problems at two local ranges in the past, at one of them the shotgun range was just like yours about even with the chicken line and to one side separated by a tall dirt burm. The other one was just over the hill at least two hundred yards away directly in front of the smallbore silhouette range.
In neither case were the shotgun shooters in danger of being wounded by us. What they heard in one case were the bullets fragments hitting the tall palms trees that were on the side of the trap range. And in the other one they were just concerned about people shooting below them, so they limited the use of that particular range to shooting .22 RF ammo and scheduled their shotgun matches and practices around ours.
The best thing is not to be in front of the firing line unless boxes are built to contain the bullets and their fragments. I have seen several of them used at ranges where the concern of the bullets leaving the range was there, some of them were built out of heavy sheet metal, others with lumber or even old tires.
If you ever noticed the smaller than a dime lead slivers just in front of the metal targets? Well that is all that is left from when the .22 bullets hit the targets square, the rest of the bullets splatter 360 degrees and if someone is standing on the side they are going to hear and maybe feel the fragments if they are too close. Another thing is the noise .22 bullets make when they ricochet of targets edges, rocks, and stands.
There is nothing more unsettling than hearing the bullets scream by when they ricochet if you are in front of the firing line.