I have tried with both printers. On the Aquila I just follow the regular leveling process, I.E. set the bed height so at each corner I can just start getting some dragging resistance on a piece of standard printer paper. On the X3 Max I do auto level, then auto home to get the print head to Z0 position. I then set the Z offset to again, where I can just get some dragging on a piece of printer paper.

It works swimmingly on PLA, but PETG not so much.

Temps are set to the specific PETG MFGs specs, typically around 230c on the hot end, and about 70c for the bed. Of course I am getting the specs from the product details on Amazon...

The PEI plates get regularly cleaned with alcohol wipes.