I have a 6 inch Atlas jackplate with a yamaha 150 fourstroke, on a 2014 Key West 210 bay reef.. Could the mounting, of the turbo swing, to the jackplate, and not through the transom be a problem? There is a powerpole also mounted to the right side part of the jackplate. What about clearance?

We have had success when installing a TurboSwing with power poles and jack plates before, (even ladders and swim platforms). When installing with a jack plate it actually makes it easier to install. You won't have to drill through your transom but drill through the jack plate instead, or your jack plate may already have accommodating holes.