Visited on Sunday without charging.
The charger along the street on the east side of the buildings.
When you arrive from the south there are EV signs at the level of the main parking telling you to continue further down the road.
There are 2 parking spots painted with an EV logo, but you can only charge 1 car. No idea if this is a plan for future expansion or incompetence.
This charger seems to be operated by EW Rothrist, but it's not listed with their other public chargers on their website.
There's no signage suggesting it's reserved for visitors of the zentrum. At the same time, there's not much to do around unless you're going for a walk. This is in the middle of nowhere.