Do I need more than 2 rock structures for long tank?

[Miami Reef]

300 gallon tank.

I want to make it look like the picture, but my tank is much wider in proportion.
Will I need to double the structures of the picture and put 4 instead of 2? I like how the 2nd picture has the left rocks on a diagonal slant.

 

[afk-47]

why not going for three sections? do the slanted portion not the side like the first one and then two islands next to it.

 

[monkeyCmonkeyDo]

Its ur tank. Do what makes you happy. Me personally i like the 1 big structure and 1 smaller.
Hths
D