How can I stack several 3D elevation layers?

Question

So far I have been using qgis2threejs to display different layers at once like one terrain elevation layer and one population data layer. The result through is that the 3D population data is not sitting on "the mountains" but on flat   floor with z=0, sometimes hidden below the terrain surface. The layers are displayed in parallel but not on top of each other which should be case.
I could add both layers and display them as one but then I can't manipulation the colors individually with is essential for my work.
I am using qgis2threejs because it is intended for online users to explore. But I am also willing to learn other tools. I am just unsure which can do what I am looking for.
Maybe Mapbox? Deck GL? gVSIG? Do need the commercial ArcScene?
It would really be good if it's possible to explore the resulting 3D visualization on a website.
Below you see a screenshot of my issue. The peaks of population data appear under the mountainous surface, instead of on top of it. I projected the colors on the elevation layer so but thats missing the 3D effect of course.

Mario · Answer

I don't know if you need to convert a 2D vector layer to 3D based on a DEM or you only need to show the vector data on the DEM.
For the first case you can see this post: https://blog.gvsig.org/2019/02/06/towards-gvsig-2-5-plugin-to-convert-a-2d-vector-layer-to-3d-from-a-dem/
If you want to show vector data on a 3D view you can watch these videos:
https://blog.gvsig.org/2018/02/26/gis-applied-to-municipality-management-module-15-gvsig-3d/
https://youtu.be/aoy-JwkFPeo?t=1947
(at the second one I've linked it to the moment where 3D View is shown.
Finally, if you need to learn how to start working on gvSIG (symbology, labelling, editing tools, geoprocessing...) here you have a video about it: https://blog.gvsig.org/2018/03/21/learning-scripting-on-gvsig-in-half-an-hour-videotutorial-available/

How can I stack several 3D elevation layers?

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