Tim Lamb wrote:

Next issue is fixed load (kitchen units) on 18mm chip over 40mm PIR
foam.

Scrub that last bit. I think it will have normal screw in feet!

This sort of thing?

https://screwfix.com/p/kitchen-plinth-feet/36145

Given that they manage not to dig in to the 18mm weetabix of cabinets,
why would they dig in to an 18mm weetabix floor?