Phoenix handed our 2007 Phoenix Cruiser 2350 to us with the Fiamma brackets in the big bag with documentation and touch-up paint. They also included ropes and stakes, seemingly Phoenix's recommended method. Knowing myself, I would never rope-&-stake-down the awning, so I spray-painted the brackets a matching gray color and mounted them. I feel utilizing the brackets is the right method for the Fiamma awning. Stakes and poles may work, but not friendly to work with.
As far as "wind" is concerned. With the brackets mounted below floor level, the poles extend out very nicely and provide excellent stability. VERY importantly, ALWAYS use the extra center support. That extra support allows you to tighten-up the fabric so the awning is very stable in breezy weather.
I wonder if the 12 foot awning did not include a center support. To you with the 12 foot awning, do you have one? Our 14 foot Fiamma, the center support is stored inside the entry door jamb, opposite the awning crank.