After updating the files and testing them out in game, I thought about the idea of letting my Sims play in the fountains by making only a shallow pond where Sims are able to walk through, and then place a fountain.
In the images above a short tutorial on how to accomplish that, although it's not that complicated and you probably won't need the images at all... 😅
In the first image I placed both fountains in one spot for a nice looking fountain. 😎