Yeah here in the EU, new, they are mostly hanging toilets with a sewer connection via rubber sealed PP pipes.

Then you caulk the top and sides and not the bottom (which is more open) so that any leaks leak onto the back tiles and are immediately noticeable and not into the subfloor (which here in Belgium is usually screed + brick/concrete)

Also extra benefit is that there is no toilet connection with the tile to clean around, you can just mop directly under it and any kids “missing” will be easily cleanable.