The most fragile part of an acoustic guitar is the body. Because the body is supposed to resonate with the sound of the strings, their body material has to be flexible. But this also means that it is brittle. This is why it is safer to store guitars using a wall clamp. The neck of the guitar can support the weight of the guitar. Before you mount the guitar on the wall, you have to make sure that clamp is fixed firmly on the wall. Also, the size should be suitable for the fret of the guitar. In case you want to hang multiple guitars, remember to leave enough space.