Where your carry stands

Each board is 4 rows of 7 hexes. When a fight starts, the two boards meet front row to front row, so your back row is 4 hexes from their front row and 7 from their back row.

Every unit starts the fight on the closest enemy. If that enemy is within its range, it attacks from where it stands; if not, it walks toward it until it is. Range is counted in hexes, and set data gives every champion one. Most ranged champions this set have range 4: from your back row that reaches their front row and nothing deeper. The longest is 6, short of the 7 hexes between the two back rows: nothing reaches from one back row to the other until someone moves.

So the first hits land on whoever stands closest to the enemy, and a ranged carry wants to be the unit they reach last. That is the back corner. Enemies have to get through or around your front line to reach it, and only 2 or 3 hexes touch a back corner, against 6 for a hex away from the edges: fewer hexes an enemy can hit it from, and your own units can fill the rest.

The corner has a cost. From there your carry reaches only the enemy units on its own side, so the side you choose decides who it hits first. A melee carry plays by other rules: it has to walk to its target, so it stands beside the front line, on the side it should break through, not in the back.