How do I Determine the Z-Index of Dynamic created Objects?

Hello my friends! Happy new Year!

I have a problem with Z-Index of dynamic created objects, can anyone help me?

The objects are in the same family (i think this can help to find and change the prop).

Correct:

Incorrent:

Thanks in advance!

Happy new year!

I would sort them by the Y value.

Thanks my friend!

I know i need to use the Y prop, i find a tutorial with an example.

Thanks again!