Monthly bike parking space guaranteed?

I'm considering getting a bike to commute to the station, but I have no experience with bike parking in Japan. If I pay for the monthly parking fee, is it pretty much guaranteed that I can find space every morning? I don't want to bike there only to find out I need to ride around to find space…

I did find this interesting map that shows the number of total spots per parking space: https://www.ecostation21.com/kawasaki/map_takatsu.html

Any bicycle commuting experience would be appreciated!

by wallesis