I used to make cabinets for 8 years, but I just stopped doing it. As far as I know, if you use a marble undercounter basin, it must be bonded with marble glue. In addition, you must have The fixed points bear the weight; if it is a white steel undercounter basin, use embedded parts to fix it and seal the gap with glass glue. You'll understand after you see it for yourself. Don't just listen to the salesperson. He may not be professional. Haha