Can I beckon multiple summons on the same spot?

FAQ

Yes, you can...

The keyword that allows you to do this is the word "place". When something is being placed on a spot, it does not care if that spot is occupied or not. This also applies for cards like Teleport. 

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If I want to attack and there is a spot with multiple things on it, do I get to attack them all?

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Does Idiris's Fire Ball [2] ability have to target something in her awareness?