Structure spawning problems

I cannot find a way to successfully spawn structures due to the way they spawn in the world.

When spawning, the structure sized area is basically cut out of the world and then the structure is pasted in. This almost always seems to result in an unnatural spawning where a hill or even slightly uneven terrain is cut out in a rectangle with the structure placed in.

Some merging can be done with the use of structure void blocks but the only structures that seem to frequently work are those with a 2x2 to 3x3 size base. For some reason, I have not seen a small structure be cut into a hill.

Has anyone found a successful way to spawn structures?

I was wondering about possibly using the dummy block method but then also using the procedure to do a "manual" check for blocks around to make sure the structure isn't being placed into the side of a hill, or just only using structures which are like a self-contained diorama, so blend themselves in better?

Any ideas?