....will inevitably suck and should be avoided at all costs.
I've played courses where the range is offset at an angle, parallel to the hole, perpendicular, you name it. And it doesn't matter how high you build the fence or otherwise, plenty of balls will still end up in that adjacent fairway. Whether its thru holes in the fence, rolling under the fence, shanks, or even kids goofing off on the range intentionally hitting wedges over it, plenty of balls will always find thier way on the hole. Nothing is more frustrating than looking for you ball which landed in the correct fairway and having to waste 5 minutes sifting thru the other balls just to find yours.
That being said, if this can't be avoided, at least use yellow or pink range balls, so they are easily distinguishable from yours. And as a courtesy I'll usually pull out my 3 iron and hit the balls back towards the range to at least get them out of the fairway so its easier for the next guy.