Visited today without charging.
The 6 charging spots are next to each other in the "EG" parking floor that hosts the "XL" parking spots. The situation was quite chaotic with everyone trying to park there while the other floors of parking were almost empty.
I don't think it's possible to drive up to floor EG from P1 or P2, so you need to take the correct entrance, which is the one on the right marked "EG / XL Parkplätze".
It's a nice setup with the large parking spaces and 6 chargers, which makes this one of the largest from Migros (though they are opening a lot of new locations right now with reasonable amounts of chargers).
Unfortunately there was already some ICE-ing going on. One electric car not plugged in and one combustion car. Out of all the vehicles parked (now gone on my pictures), I was surprised to see that the Toyota was the one actually charging!
The parking barriers were completely off and there was no payment kiosk for the parking so I think it must have been out of order for a while. So parking is free for now. There's a sign at the entrance saying the parking is only for Migros customers.