This is my take on XT60 connector wall/panel mount. Based on XT60 connector panel mount and this remix https://www.thingiverse.com/thing:2909363 You can use the cable side from there. I designed it from scratch to meet my requirements. It is designed to be mounted on the inner side of 3mm panel with corresponding hole in it with 8xM3 bolts. It fits both male and female XT60 connectors. They are clamped securely with M3 bolt and nut. V2 is somewhat more compact but I have not printed it. It should be Ok. The last three pictures show the junction box I made that is the reason for me wanting and designing these.
You could make any tweaks with the included FreeCAD source.

Any comments, suggestions, makes,.... are appreciated :)