Since i needed a simple but adjustable wall mount for my 2.1 satellites i decided to design one on my own. There are a few good ones here on Thingiverse but either they needed support for printing or they where to bulky for my purpose so i came up with this one.

Only one 4mm screw and one 5mm dowel is needed for mounting it to the Wall, which should be more than enough for most satellite speakers. In my case i'm pretty sure the plastic will break long before the 5mm dowel gives up.. To connect the two parts i used one M4 nut and one M4x20mm bolt but everything between 18mm and 40mm length will work. Adjust the angle and the direction before tightening the bolt. The speaker is mounted with an M4 Bolt (a washer and a nut) as well.
Good Luck :-)