Please see my "Heated Bed Guide for the Mega Zero v1.0 (Melzi & Mini MZ)" for details on how to use these:

https://www.thingiverse.com/groups/anycubic-mega-zero/forums/general/topic:51938

UPDATE: v3 is lower profile and means you can squish your springs down more if desired.

The Cable Strain Relief is designed to be Super Glued to the Bed Adapter Bracket in-line with the Left-side Y-rail (from front PoV).

The Bed Adapter Brackets are designed by TH3D and are re-hosted from here:
https://support.th3dstudio.com/hc/guides/diy-guides/anycubic-mega-zero-v1-heated-bed-upgrade-diy-info/

I got the Bed Adapter Brackets printed out by a local 3D Printing Specialist in ABS @ 60% in0fill - I don't recommend using other print materials or you'll have serious issues with warping due to the radiant heat from the bed.

Print Settings

Printer:

Anycubic Mega Zero

Rafts:

No

Resolution:

100

Filament: X3D Pro PLA White