Height for Elevated Planche Leans

This is probably a question with a very obvious answer, but I was wondering, how do I determine whether the elevated platform I'm using is too high or too low?

i think that if you measure height of shoulders at normal lean. this height is exactly what you need for elevated.

Hmm if I try that, it feels as if my body is diagonal.  Not sure if that's normal

A little bit less than shoulders height.

Thanks less than shoulder height was what I was thinking but wasn't sure