Auto-Level installation kit instructions?

I tried glass trick.
I tried mirror (it should shatter after 100c print finished)
I tried tempered glass (its never flat, i spend enough money to learn that)
I was able to fix the warp going from side to side but running threaded rod under the bed with drilled angles and bolts at the end to create tension.

But it only resolved warp from side to side, not from front to back.
To fix the warp from front to back i would have to tighten the belt.
This is upgrade of Y axis, tightening the belt wont do anything.

I got my bed this way and for long time i wasnt aware of it because i was printing mostly small pieces at the front of the bed.
When i finaly started to print BIG (just like the front of the bed mount above)
big like this:
Then i ran into problems.

Thats why i ask if the auto leveling kit (where do i buy it ?) will learn my bed curvature and move Z (up or down) as X and Y move over the gap.
I suspect NO