W
Waluigi
If it’s a proper stone resin tray then you won’t be screwing anything to it. I’d use the stick on pads. Screwfix sell the quadrant kit with plinth for £30
I tend to prime the underside of the tray with a tiling primer and then stick my pads to the tray.
I tend to prime the underside of the tray with a tiling primer and then stick my pads to the tray.