Using an indicator to get a vertical presentation will help to keep from snagging or lining fish. Especially if you keep the length of leader/tippet close or less than the actual depth of the water being fished. Even with this technique it helps to be catious with what you are doing and only setting the hook when you know a fish has taken the fly. Sometimes it is easy to tell if the fish has been lined or snagged and not setting the hook will let it be easily pulled out or fall off ect...
I say if fishing a stacked pool is you only chance at a fish then go at it just be carefull.