Custom Structures always near each other

Hello
I need help with my custom structures. I have these two called Trial Ruins and Undead Knight Arena. I noticed that whenever the ruins generates, theres always a 50/50% chance my other structures such as the arena spawn either near it or AT it, like it actually overlaps with my ruins structure.
The image is my structure and structure_set files for the two structures.
How can I avoid my structure from spawning near my other custom structures and how can I stop them from overlapping even with the vanilla structures? Thank you!