Strike part of my previous comment. I did another download from GitHub, reinstalled it, and it found the 3S configurations.
I can not find the profile for the Mark3S. The web site says Slic3RPE + drivers but there are only the drivers. I went to GitHub and up[graded to V1.41.3 which says it is for the 3S but when running the wizard it only shows the Mark3, not the 3S.
The M3-40 does not hold with my Einsy door - guessing it was stripped at some point. I wound up using a velcro strap to keep it closed.
There does not appear to be a plug aligner in the upgrade kit.
Another vote for 12mm - and I left a large gap rather than crush the cables. Also another vote for removing the door to get access to, among other things, the cable holding screws.