Custom collision handling override for spawning

I have set up a checkpoint system that works fine for the most part. The spawning collision handling override is set to " try to adjust location but always spawn" for players (and ai), as this works best so far since its fairly frequent that players or ai spawns nearly at the same time. Now this is sort of okay, but what this does is when theres a new spawn at the checkpoint, the next will spawn on top of the existing one - its pretty funny but not really ideal. I’d like to set up a collision handling override to adjust spawning on the other two axis instead of Z - so the new spawns dont end up on top of each other but rather next to each other.
Any idea on how to do that?