The existence of clouds depends on the complex physics of atmospheric transport.
In atmospheric layers where a condensible species exists in vapour-pressure-equilibrium, clouds can form. The latter depends on temperature, and large-scale cloud formation influences the radiative properties of an atmosphere, i.e. the temperature.
So in all generality this is a very complex problem.
However it is possible to set limits onto where condensible species can be transported to, by setting a limit on convection.
The large-scale transport of material in planetary atmospheres seems to have a hard limit to < 0.1 bars, which is the absolute upper limit for atmospheric convection to happen.
This is because above 0.1 bar a temperature inversion forms as the atmospheric gases become radiatively inefficient, with the exception of Titan, which prohibits convection, according to the Schwarzschild criterion.
The 0.1 limit on temperature inversions is described more in detail in this article (https://www.nature.com/articles/ngeo2020, and their more detailed model description in https://iopscience.iop.org/article/10.1088/0004-637X/757/1/104).
So then, once you have translated pressure coordinates into altitude, via using a planetary structure model, you would have your answer in km above some reference level. Sadly the latter is not an entirely trivial task, and people have worked on planetary structure models for decades now.
As a snarky comment, I would expect your meteorologist contacts couldn't help you with this because they seldom study more than one atmosphere.