What will be needed:
- Foamed PVC 3-5 mm (you can use also wooden planks, but the PVC are easier to cut, even with a carving knife);
- Carving knife;
- Double-sided tape.
Cut the PVC in the form that is shown on the images below and glue them to the ledge with the double-sided tape. If you don’t have a ledge, you can make one from the PVC by cutting a long strip and glue it to the wall.
Making this will give you some space between the wall and the PVC where you can hide your cables. Look at the images to get a better idea.