I don't know much at all about qgis, unfortunately. QGIS has a steep learning curve. Another thing on my long list of things to learn about.
I believe there are plugins the interpret the data as a height map (colorized perhaps). Google suggests there are various plugins for creating height maps from your GIS data (including DEM): https://plugins.qgis.org/plugins/HeightmapExport/
might be one, although I'm not sure. Also there is a way to get data under the mouse cursor: https://gis.stackexchange.com/questi...points-in-qgis