I live in just south of Houston zone 9a and my waterfall is doing great. It takes a few hours of morning sun (recommended) and should be somewhat protected in the afternoon. The waterfall can take a beating, but I wouldn't risk giving it full sun for most of the day.

Bloodgoods can take the Texas heat if somewhat protected from prolonged exposure to full sun (which is true with most maples grown in Texas). If you are worried about maples that can survive intense heat consider the Fireglow; it is very similar to Bloodgood a little darker in color, and can take a hotter climate.