Terrace slabs on EPDM waterproofing - Alternative to pedestals

And exactly for this, one then places underneath on the quarter of the pedestal (above between the plate and pedestal).

I was not aware that plate bearings are adjustable.

However, they definitely should not wobble, no matter how uneven the floor is. Have you ever stretched a string and leveled the height? Please be very meticulous there.

As a finishing touch, mount an L profile on the edge; ideally, it should have been under the screed before. Now it might happen that when you drill and water gets in during winter, there is space. Maybe it can be glued.