The meters on the Mixing Station App run the full length of the fader panel which at least on my tablet (Galaxy Tab S 10.5) means it looks like it runs up to over +10dB. Obviously this is not the case (I'm assuming the meters show dBFS rather than dBu :)
The Beheringer app and the X-Air edit on Computers have the meters stop at the 0 line on the slider and then use the space above that for the Dynamics and Gate meters.
It might be an idea to replicate this layout or put a separate scale alongside the meter
Mixer Model: XR18
App Version: 0.001.1