In SB, tanks within the same platoon will try not to aim at the same targets. This usually works quite well. A more difficult problem is getting the tanks to simultaneously pop over a ridge and fire all guns nearly at once.
Typically one tank will pop over the ridge first or last, and you'll see two or three guns firing at once, followed by the rest later. This can lead to a less than perfect ambush situation, but it varies quite a bit do to the randomness instilled in the sim. To set up an ambush, you would give a platoon hold fire orders, and then set an "open fire if" condition.
This condition can be as simple as a trigger, or it can be more complex, such as waiting for a certain number of tanks to enter a user-defined region. Alternatively, you can simply set a maximum firing range for the platoon. As long as the platoon has hold-fire orders, it will try to stay in a turret-down position to stay concealed.
Placing the unit near woods will also help prevent early detection. More.
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