These corner protectors are absolutely worth the money. We had this get once in a discount store, but unfortunately no adhesive surfaces were installed here, so you had to resort to other suppliers (Tesa). Here, however, generous surfaces are attached, so that prolonged maintenance is ensured. The all-round protection helps. And a corner contact is not as painful as without this protection.
We have all made for our little "nasty" corners reasonably safe with this protection.