Corner guards for a range of wall types: concrete, drywall, and plaster/tiles.
For example, the HS-4 corner guard can be retrofitted to most wall types. The HS-4 can be fixed by adhesive or screws. The HS-2 is another example, which can be used on tiled plaster walls. In this case, the HS-2 is fitted to one or two layers of plaster, with tiles as the top layer.