How can a basalt plate like this (picture of the back of the plate) be safely attached to a wall? It's 20×30 cm big and weighs around 2,5 kg.
I can't drill a hole/attach a hook to it because it could crack the plate and I'm scared for adhesives because of the rough back.
On top of that, what we'd prefer is a system that is not (or barely) visible from the front of the plate.
by kronosrevived