Autoscale Text + Dynamic position

Hi !

I use several expressions of Dan Ebberts to have an autoscale text:

Anchor point :
sourceSize = thisLayer.sourceRectAtTime(time, false);

T = sourceSize.top;

L = sourceSize.left;

W = sourceSize.width;

H = sourceSize.height;

([L+ W/2,T+H/2])

Size :
maxW = thisComp.width*0.9;

maxH = thisComp.height*0.45;

r = sourceRectAtTime(time);

w = r.width;

h = r.height;

s = w/h > maxW/maxH ? maxW/w : maxH/h;

[100,100]*s

It works great, the problem is that I have several text layers and I would like the position of the layer below to move according to the height of the text above. They must not overlap and move keeping the same distance between them.

I tried using the following expression on the position of my bottom layer:
st = thisComp.layer("P1");

         sh = st.sourceRectAtTime().height;

         tp = st.position;

         np = [value[0], tp[1] + sh]

Unfortunately, as the top layer has a scale that varies due to autoscale, the position is not well calculated.

How could I solve my problem?

Thank you in advance for your help.