For a more permanent mounting, angled viewing and corner mounting you can use the optional VESA mount.
The mount is first fixed to the back of the SoundEar 3 Noise Sign and a VESA mounting bracket is fixed to the wall. The noise sign and mount are then fixed to the wall bracket.
The SoundEar II also has standard 75mm x 75mm VESA mounts - this is the standard for mounting televisions and monitors, so many types of mount are available.