Current questions and answers regarding the map editor.

Exactly as Jass said. But! There are some nuances. For example, if you place one 3x3 creature and one 1x1 creature in a squad, the battle will start normally, and the creature will remain in its position. I don't know how it works, but it has been tested.
Other problems are possible. For example, if you summon squads to a random position during a battle, they may be summoned onto a larger creature, and the entire group will get stuck. Accordingly, in such cases, you need to control it.