yes, thanks, this is of course the ‘old style’ approach,
but systemd should manage this today, but it does not work on opensuse,
what I remember, in former days I used openSuse, the tmpfs option could be set in yast via system settings or so,
however, today the systemd way ‘should’ work … I know it works on rhe7 with systemctl enable tmp.mount since I did in at work today
I do not know about the systemd way (it looks as if systems claims to do everything), but imho a reboot is required between switch such a thing on and it being active.