Catch with retaining wall - height specification

Hello,
I want to retain our sloping building plot with a retaining wall. These are approved without a permit up to 2m here.

Our plot, as already mentioned, is on a slope, but it is also slightly sloping (about 1.5m) from the neighbor's boundary to the other side.

We want the wall itself to be completely straight.

My question now is: from which point do I measure the 2m?
Is the center taken here? I found no information about this in the regulations.

Regards

Weird question!

Measured from the natural terrain.

If the back is then 1.5 m higher, you are not allowed to simply add that to the front to keep it level.

And what does the maximum height that I can construct with approval depend on? Do the neighbors have to agree here? I would like to build higher than 2m.

Our property is, as already mentioned, on a slope, but in addition it slopes down from the neighbor's boundary to the other side as well (about 1.5m).

And in this direction you now want to fill up, or what is the wall supposed to hold back?

: I think he means that his property is on a slope, so it slopes down from north to south and also has a different elevation level from east to west. If he only fills up the slope (north -> south), he would still have the gradient from east -> west. To intercept east -> west, he would have to build the retaining wall higher than the permitted (approval-free) 2m.

: So you mean, I understood correctly that it is about skewness in two dimensions; but I am wrong in assuming that one is content with correcting only one?

So the goal is now to "straighten" the property in both dimensions?