\include "predefined-guitar-fretboards.ly"

<<
  \chords {
    c1
    c1
    c1
  }
  \new FretBoards {
    \chordmode {
      c1
      \override FretBoard.fret-diagram-details.orientation =
        #'landscape
      c1
      \override FretBoard.fret-diagram-details.orientation =
        #'opposing-landscape
      c1
    }
  }
  \new Voice {
    c'1
    c'1
    c'
  }
>>