Moin @Dj_MuMiN,
be glad to have only 1 line power, so you phps only have trouble with a single source.
To have more than one socket, I handled in the attached way:
https://community.enginedj.com/t/improve-push-response-on-the-jog-wheel/57395/31
That’s my responsibility and everything is fine with the grounding 
Good Luck BeatMaster