Normals map newbs question

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Hello everyone, I'd like to ask you something about normal maps, how do you get right of hard edges sticking out of smoothed normals?
Im not talking about the 90° uv split or smoothing groups, I already know that, but still, if I have for example a box like pic related, and the high poly has smooth edges, those sharp ones in low poly will always stick out, fucking up my normals, how do I avoid that? It happens to me with every smoothed edges normals, any tips?