As the short term and long term parkings share their ramps and foot exits, I put most of my observations in the other discussion https://forum.evromandie.ch/d/3338/2
The P+R area hosts the Energie360° AC chargers.
On the PZAG website https://www.parkingzuerich.ch/parkhaeuser/stettbach-pr/ it says there are 2 chargers here, at parking spots 401 and 402. There indeed 2 charging spots but the parking numbers are 403 and 404.