Stacking Trofast?

[u/Rivka503]

I'm making a children's bedroom based on Trofast. They are all the white kind. I have a bunch of the 46cm wide, 145 tall ones. I also have a shorter one for under the window and some smaller size wall ones.

I want to buy some 93cm height, 46 wide ones and place them on top of the 145 high ones, as there's a full wall of lost space there.

What would be the safest way to do that?

This is about what I'm looking for, but looks more fancy/complicated than what I was planning.

ETA- or maybe there are other ideas for using that space that I haven't yet thought of