I create “magazine” for yours N2O “bullets” :-) which fits into kitchen cabinet (275mm height; you can see it on my photos, sorry for my poor English). It can stand itself, but it is ready for clamp to alternate holder (my idea is that you can drop it with back (or bottom) horizontal hole onto holder´s hook and clamp it to fix - you can see clamp grooves on both sides of this model). Yours alternate holder can be mounted on the wall or so. This box must be removable, for easy inserting N2O patroners.
In this profile is added text “N2O”, but model is without any text. You can modify it as you wish.
Created in FreeCAD. You can download .step file too.
I will create some external holder(s) to mount it on the wall soon.