Corner protection exterior facade new building

Hello everyone,
we have newly built and are currently landscaping our garden.
We were advised that a pointed protection should be installed for the facade to protect it better.
We found the idea on the internet to combine a pointed protection with a path (see photo).
But what I wonder is, how does the water drain with such a solution? As a frost protection layer, it should theoretically be gravel, right?! Or am I seeing it wrong?
What is the best way to do this then?
Thanks for the help

What I do wonder, though, is how the water can drain in such a solution?

What is your specific problem? It is identical to "normal" splash protection. The panels are sloped outward.

My question is whether the water that goes into the gravel edge can percolate through the compacted crushed stone. Not that the water "pools" under the slabs. Sorry, I am a layman.

Install drainage, place it in cheap gravel and on top the nice expensive granite gravel