It is wonderfully described here on the manufacturer's website: https://ch.hama.com/00049594.... I hope this helps.

Hello Darkstar82
The speaker can be screwed on from below as well as from the side.
The speaker stands come with base plates in three sizes (6.5 x 6.5 cm, 8 x 8 cm, 11.5 x11.5 cm) and a bracket for side mounting. The scope of delivery also includes various screws, washers and nuts. Nevertheless, it is possible that the screws are not suitable for some boxes, as it is never possible to cover all eventualities. In this case, suitable screws may have to be purchased from a DIY store.
Greetings
Andy from Hama