Bullet hell movement

That's too vague of a question. Provide examples from other games, your own map, and try to describe exactly what you're looking for.

Some examples:

This is what I think you're referring to, where enemies reposition and strafe around the player:

But maybe you want something like a Flow Field to have the enemies swarm the player from all directions:
 
What is unit representing in your context?
  • The player character?
  • The monsters that try to walk into the player?
  • The bullets the player or monsters fire?

That said the WC3 engine is not at all designed for that type of game. Especially if you want to use the built-in path finder there are some pretty serious limitations to moving unit counts and unit on unit collisions.
 
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