Ooh climbing anchors sound fun. That’s got to be quite deep to hold any good weight in concrete. I only worked with static weight anchors - once finished there will be no change in weight or pressure at any given anchor.

To have concrete holes drilled that could hold a lot of weight shifting over and over seems like It mostly Depends on the anchor, since regular screws rarely hold anything over 5 kg reliably, and not when you jerk It around.

If you don’t mind, keep me updated! I’m intrigued.

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The reason for this is that the rebar is most likely a grid of 20cm squares placed along the walls of the room. If the ceiling is poured concrete. If, on the other hand, it is made from prefab elements, all rebar will probably run in one direction only.