Hello gyuseppe,
I have two small Brahea moorei growing in our garden here in leeward upslope Kona, Hawaii. They are very slow growing and I was told to plant them in a mostly shaded area (morning or filtered sun should be OK, however). This must be about the only Brahea that prefers shade. My 2-plants are growing pretty much on their own with only an occasional supplemental watering if it gets extremely dry. Here they are in photos: