Your specified one is also indicated on the inside of the packaging ... just as a version is indicated for cutting baseboards with miter joints and joining them with silicone (glue was my version).
Exactly Ikea expert, I agree. But it might be the only possible option, it's not so great, but unfortunately I have to decide soon .... I also don't really like the tight fit. That's why I'm looking for suitable outside corners for my project .... but I really can't find any, I don't understand at all....