This single Planer Wave System does the job that would otherwise take several microphones.  It attaches to either side of the soundboard without holes to drill or tools.  We typically see it attached under the piano with the rest of the equipment and mix the output with a ROLLs multichannel mixer.  QRS part number 70530  The output of which is then typically piped through the home.  
The setup is used when customer prefers the mix of actual piano and QRS content vs the MIDI generated piano sound out of the QRS sound module.

Battery or wall adapter powered
1/4 in monitor output with variable level balanced
XLR main out with ground lift and output pad switch (0db/-12db).  
Includes Piezo crystal for piano/harp.