Pretty much like you have it in the pic is how it needs to be printed. Flat side down. Im not sure how big this part is but there appears to be thin vertical walls in some of the upper areas so if it were me i would print this with 1 perimeter and 100% infill. Abs or nylon. Whatever you want ti use. Abs will be more rigid and will break under stress. Nylon is more flexible and will bend easier but not actually break.