More spikes and stuff, help!

I’m trying to add this type of boulder which is much bigger than the large one and its called a “large_spire” Its basically like a giant spike coming out the ground at a 45 degree angle.

How would I add it to the generation data so it spawns in and the rest of the boulders don’t?

Plz respond if u know how :3

btw, the spire is bigger than the bunny statue like about twice as big, so i need to make sure that when they are spawned there is a big enough area under it, so it doesn’t look really out of place.

Also when objects are generated are they rotated horizontally at all? because i want every single spire to be facing the same direction.