Gotta say in my experience I place my indicator 1 1/2 - 2 x the depth of water. As was mentioned I like to use weighted flies or shot to keep down. At least on my point fly. I commonly drop flies at multiple depths between my p-fly and indicator. I find sometimes the fish like the unweighted flies better. I am also a big advocate of fishin w/o an indicator.. tightline with a sighter. I can cast fairly far and I miss far fewer fish. Hope that helps, as far as I know there is not a carolina rig for ffishing
just gotta experiment and have fun.