The most common factor is the thickness of the tiles. For ceramic slabs, it is typically a minimum of 2 cm, but it is always advisable to follow the manufacturer's recommendation. As pedestal manufacturers, we recommend using 4 support points for 2 cm ceramic slabs and 5 cm concrete slabs. However, the number of support points may vary depending on the slab manufacturer and the quality of the concrete. For stone slabs, the number of support points depends on the material type and slab size, so it is always important to consult the manufacturer for specific guidelines regarding the installation with point load support for terrace slabs
You can find more information in this article- 5 rules to prevent the tiles on adjustable paving slab supports from cracking.
