\setuppagenumbering
  [alternative=doublesided]

\setuplayout
  [backspace=5cm,
   width=middle]

\starttext

    \dorecurse{4}{
        \placefigure[left]       {left} {\framed[height=1cm,width=4cm]{}} test
        \placefigure[right]      {right}{\framed[height=1cm,width=4cm]{}} test
        \placefigure[inner]      {inner}{\framed[height=1cm,width=4cm]{}} test
        \placefigure[outer]      {outer}{\framed[height=1cm,width=4cm]{}} test
        \placefigure[leftmargin] {left} {\framed[height=1cm,width=4cm]{}} test
        \placefigure[rightmargin]{right}{\framed[height=1cm,width=4cm]{}} test
        \placefigure[innermargin]{inner}{\framed[height=1cm,width=4cm]{}} test
        \placefigure[outermargin]{outer}{\framed[height=1cm,width=4cm]{}} test
        \page
    }

\stoptext
