Curved line array

I bought 32 woofers and 32 tweeters (as per Zaph's dirt cheapos).
The current plan is to stack 2 line sources assisted by 4 x 12" woofers (ELF) .
I noticed that Electro Voice and Bozak had curved arrays in order to compensate for tweeters roll-off. My listening distance is 5 m.
Height of line array will be approx 2,3 m. Should i fokus the curve origo to listener's ear, or may a listening "window" 1 m height be more universal (i.e origo behind listener) ?
Your thoughts or experiences are welcome.