What is the most comprehensive website for booking parking spots in Munich/Bavaria?

For work purposes I need to stay in a suburban city near Munich that has very limited public transport. I am therefore using a car to get around.

Occasionally I need to drive into Munich city center and therefore need a place to park. So far I've been using a site called Ampido for reserving a parking spot, but I strongly suspect it's far from comprehensive as I've seen plenty of parking garages not mentioned there. Likewise Google Maps doesn't have a lot of parking spots. So the question is - what is the most comprehensive website for reserving/booking parking spaces in Munich?

I could obviously park on the street and pay at the parking meter, but the ones in Munich only seem to accept coins which is inconvenient. Likewise I could find a parking spot somewhere in outer Munich and take the S-Bahn, but I prefer to have a predictable place to park rather than circling around town looking for a free spot.