However, Villeroy & Boch offers wall-hung toilet models with a hidden SupraFix mounting system . It makes installation easier and faster, and the mounting bolts are hidden in the ceramic body. In addition, this system allows you to adjust the position of the toilet bowl with millimeter accuracy. You can read more about this system in our article . https://sharefolks.com/read-blog/22512_tips-for-installing-flush-tank-seat-covers-correctly.html