I emailed the visa center closest to me and they answered: (translated by me)
You can enter all inviters.
So, I guess they don't care how I separate them as long as it's obvious.
In my case it's no problem because I just have 2, I will be able to fit their addresses in there too but if there are even more they should really fix their online to PDF "conversion" next time :D
Update - after I went to the Visa Center
I asked what to do in case I can't fit all inviters' information in these fields. I was told:
It's enough to only enter the main inviter
The others don't have to be on the main form, it's enough to have their information on the separate invitations.
I didn't ask anymore how to determine the "main" inviter (e.g. in case one is visiting multiple people for the same amount of time) because I didn't want to be annoying :D - but I think now most is clear. ;)