Help with Raid Battle Dimension

I'm trying to make a randomly-generated Raid Arena dimension for a mod(Similar to Vault Hunters), and I'm trying to get the structure to generate on dimension enter. Currently I'm trying

Trigger on Dimension Enter

Place at x: 0 y:100 z:0 structure: altar_dimension_spawn
For each player in the current world as Entity iterator
    Set location of target entity to x: 0 y:100 z: 0

Can't tell if either structure creation or teleport are working, tried teleporting manually and didn't see the structure.

I'm also using a multiblock structure to teleport into the dimension versus a standard portal, and would like to teleport all players within a radius into the dimension simultaneously. I'm not quite sure how to do this, or if that would cause issues with the current procedure above(I assume main issue would be when procedure triggers).

Side Note: I'm planning on throwing this mod into a 1.18 pack, and am not sure if there would be an issue. Saw somewhere that it should be fine as long as you don't mess with world gen stuff and I don't know if that extends to dimensions.