The ideal position of the Gartley pattern is presented here -> Gartley pattern and Elliot Wave theory
See also Gartley pattern definition to read how it was defined by the author.
For me it's the most powerful market setup.
BTW: The continuation Gartley pattern is already a mutation and is still a valid (not ideal, but valid) location if one understands the wave degrees (context of waves within waves). The Reversal versus Continuation Gartley concept is presented here: Reversal and Continuation Gartley pattern