Generate Building with geometry nodes.

If it isn't obvious I want to generate a random building with geometry nodes like in houdini. I want to be able to place an object on an vertex or an edge or a face without the use of vertex painting or vertex groups. Here is an image of how it can be done hopefully it makes sense. the image isn't perfect but I couldn't do the best cause I don't have much computer mememory atm. If you have a better idea mention it in the comments :)