Visited on June 26 without charging.
The chargers are in the back parking lot. There are no directions, and no vertical or horizontal signage. Just the generic CKW payment instructions.
You can enter from either side of the building. The easier is to go through/next the car wash.
Since the parking spaces are generic yellow, it would probably be a good idea to ask at the garage whether you can leave your car there. No idea what the default policy would be when they are closed.