Quantum setup for a 3X3

Hi Guys,
I'm kinda lounging here till the 420 Mag board finishes it's upgrade
That being said, I'd love to hear input on my setup
I have a Vivosun 3X3 tent flowering a GDP and a GSC
I upgraded my lights when they went into flower to a Quantum 260 XW
Is this sufficient for a 3X3 like Growers Lights have said?
I'm a little worried about the corners
Thx guys :)
 
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