Think for 4x4 it would be 6 so 5x5 i would say you could do 9 to 12 and still have room to bush. Autos in 5gal can get pretty big so i would go with 9 and see how it fills out. I grew 4 in 3x4 tent and it was packed.
Im not that knowledgeable on led lights but you might need more for flower.
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You dont have near enough light for a 5x5. 300w leds only pull about 180 at the wall. Thats 360w for those 2 lights. You should be around 750-1000w in a 5x5
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