We did it in Meilen a couple of years ago. It was in the middle of covid. The three of us (husband, daughter, me) did a first interview with three people from the committee, all of us wearing masks, them only speaking Swiss German.
We were then approved for a second interview a few weeks later, with 13 people asking questions, all wearing masks and only speaking Swiss German. That was really hard! Our daughter spoke Swiss German but my husband and I answered in High German, as best we could! Once we knew everyone would only speak to us in Swiss German for the second interview, we listened to as much as we could (SRF, podcasts etc).
Questions were about why we lived in Switzerland and not Australia (we're all Australian), why we chose Meilen, what facilities in Meilen we use, how we have integrated ourselves into the community etc etc. We talked about what we love about living here, our desire to be able to vote and participate in the democratic process, and so on. All members asked us questions and sometimes we got into discussions (e.g. about Australia). Some questions seemed formulaic and others based on the interests of the members.
For integration, we talked about our interaction with neighbours, our businesses (both based at home), the local services we regularly use, our participation in music activities, our use of sporting facilities etc. For our daughter it was no problem at all, as she did all her primary schooling in Meilen and has been a member of the music school for the whole time.
I think it's an advantage to have the whole family all do it together. Your kids will naturally be very well integrated, which reflects well on you, and they can take some of the heat!
But there's no denying it was a gruelling experience, especially the fact that not a single word of High German was spoken by them. We know we embarrassed ourselves and misheard some questions (as our daughter happily told us afterwards😉 but in the end it obviously didn't matter as we got through.
Good luck!
Kate in Meilen