You’re going to want a real answer from someone who actually has Codex: Daemons in front of them, but I’m going to take a guess that summoning from an Icon works the same as it does in Codex: Chaos Space Marines for our generic Lesser Daemons.
You place the first model of the Deep Striking unit within 6” of the icon-bearing model. So there can be no more than 6” between the bases of those two models. If you do so, the daemons don’t scatter. You then form concentric circles around that first model.
The placement of subsequent units all comes down to where exactly the models holding icons are. AFAIK there's no requirement that the one holding the icon be the first model placed.
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