Recommended Settings

Inside the data assets you will see a few settings you can tweak. Generally speaking it is recommended to set heightmaps that are relatively large, such as mountains, to Max for their Blend mode. Smaller heightmaps can generally speaking be left on Additive. Random Rotation will generate random rotations for the heightmaps as they are generated (stamped), leaving this on gives you more randomized results and has my preference. Offset will determine their spawn offset upon generation, depending on the heightmap you might want to increase or decrease this. Aside from that you can increase their sizes via the Size Multiplicator but you don't really have to tweak this much as you can determine a min and max size during the generation inside the Editor Utility Widget.

Want to spawn stamps ontop of what you already generated? Turn the Reset Area off in the Editor Utility Widget. Want to spawn stamps in a specific area? Scale the Workzone down and position it where you want then set the spawn Quantity to 1, and start generating in that area.