ᐅ Extruded polystyrene (XPS) insulation on the edge of the concrete slab

Hello everyone,
Our house will be assembled next week.
My task is to insulate the exposed edges of the floor slab with 80mm (3 inches) Styrodur after the wall installation.
The floor slab consists of 25cm (10 inches) of concrete with 12cm (5 inches) of insulation underneath.
My question:
Is it sufficient to fasten the edge insulation only with plate anchors, or should I also glue it?
The exposed edges will later be covered with a render and painted.

Insulation also includes moisture protection from above, below, and the outside.
Check with the site manager on how to carry this out to ensure the warranty is not voided due to DIY work.
What does your expert (independent assessor) say about this?