Been using lisp for years to plot always works for set size title block layouts, always used window option so a binding point would be adjust lower left point. 88 layouts in one go.

(COMMAND "-PLOT" "Y" "" "dwg to Pdf"
"Iso full bleed A3 (420.00 x 297.00 MM)" "m" "LANDSCAPE" "N" "W" "-6,-6" "807,560" "1=2" "C"
"y" "Designlasercolour.ctb" "Y" "n" "n" "n" pdfName "N" "y"
)