@TimGV it depends on the configuration options for the two HDMI outputs…
if they are always one big screen (xwindows DISPLAY=:0) then you will have to se the size/location of each MM config to position the output on each display, instead of across the single view space
if they can be configured as individual (DISPLAY=:0 AND DISPLAY=:1) then you just need to adjust the startup script (installers/mm.sh) to select the DISPLAY value