You could do what they do in larger US buildings. Non load bearing walls are not made of concrete so vertical pipes go into those walls and are encased in drywa

You could do what they do in larger US buildings. Non load bearing walls are not made of concrete so vertical pipes go into those walls and are encased in drywall. Bathrooms and so on have their horizontal pipes below the ceiling of the space underneath, covered by drywall, so just need to punch a single hole in the concrete floor per pipe.