B3S linear array

hey, its 5 pm on a sunday afternoon, and im in the process of mounting/wiring my B3S line arrays, i will have the finished results later on tonight,, but i have a question

i decided to go wiht open back, so i build a 10X30 inch baffle,

does the baffel need sides and top and bottom? or can it just be used with a stand.

im just not sure if its enouyghj front to back wave seperation

thanks again