Visited today without charging.
These chargers are listed on Chargemap and the 2 green parking spot are clearly visible in satellite pictures.
The QR codes are for payment through MobileCharge. Many MobileCharge locations are on IchTankeStrom but not this one.
There's a parking ban on the whole area, and I didn't see any parking meter, so I assume the entire parking is only for tenants. The parking spots are numbered, including the 2 charging spots. Some parking spots have company names in front, but not the charging spots and most of the white spaces next to them. It's possible they have extra parking spots not yet rented.
The access is through a one-way street that starts right next to the traffic lights and come back earlier to the West on the main road.