Doesn’t ship to “my location”.
I've only used them to find wooden studs in the past but I see they do metal too. The point here is that it seems to be a sheet of metal and not little beams.
If it's like the flat we used to have, it will most likely be a big sheet of metal, onto which wooden battens are attached, onto which he plasterboard is attached.
The cables run in conduit in the space between the plasterboard and the metal sheet.