Use the PUG (Parametric umbilical gland) on your E3NG.
Remove built-in support parts marked with “X”.
Requires 2 M3 heat set inserts and 2 M3 10mm bolts.
PUG can be found here:
https://www.printables.com/model/378567-pug-parametric-umbilical-gland/files
The author remixed this model.
Added clamp to fit PUG to Electronics Top