A good foot or so tucked up into the void and again the use of a duct or
clipped to a board means things are easy to move about compared to being
chased into the wall with bends etc. If you want to cover the clipped
cables a couple of 1" battens and a sheet of light ply/hardboard will do,
probably good from the physical protection POV anyway.

Cable tray works well.You can use cable ties to anchor cables to the tray.

Dave

--
And you were born knowing all about ms windows....??