I must say it is a long time ago I used this tool myself and that was still with fs2004. So I haven't tested it with recent versions of FSUIPC and fsx. I guess technically it should work, unless the FSUIPC interface changed a lot.
I must say I make more tools than sceneries nowadays , so don't have to place effects that often. But when I do, I usually use WhisPlacer. And I am working on a ObPlacer XML update that should let it work with FSX again.