Hi, thanks for your response.
Your solutions works great.
In case you need a more generalized version i got something similar.
For the “Volume Sampler” it’s important that your tagged mesh also uses collision.
I use some landscape points that can be offseted in z to filter my desired area from the points on the mesh with a distance to these points.
In my case the “Volume Sampler” spawns the points only on the mesh surface, but if i take a basic shape the whole mesh volume is filled with points. 
Hope that helps.