A lot of independent shops that work on Porsches are probably capable of performing an inspection, though they may not have a PIWIS computer, or Durametric, capable of interrogating the DME (e.g. for over-revs, etc.).
You might tell your salesman that you would like to obtain a PPI from a neutral shop, and see what they suggest. Are they not offering the car with a CPO warranty?
You might tell your salesman that you would like to obtain a PPI from a neutral shop, and see what they suggest. Are they not offering the car with a CPO warranty?