How to tag unknown/variable capacity for bicycle parking

Some bicycle parkings don't really have discrete spots to place bicycles, but instead they are just an area where people are expected to place their bicycles in whatever spot and orientation they please. The capacity for such parking areas is therefore very hard, if not impossible, to confidently tag.

However, it looks like the capacity tag requires a number. So I wonder what we are expected to enter if capacity is variable, or somehow cannot be determined precisely.

Sorry to say I forgot to take a picture of one of the parkings in question, so I hope I described it well enough.

This is kind of what I'm talking about, although these are not the kinds of areas that I specifically was trying to tag: https://goo.gl/maps/Tvwwvio3hF7JoXqt9

The upside-down U-shaped stands are not meant to take one bicycle on each side - they are merely a suggestion for doing so. It is allowed to place bicycles inbetween, and outside kind of near these stands. So while a minimum can be calculated here (which is not even always possible), the tag capacity feels like it should indicate a maximum, which is nearly impossible to know for sure.