I've got some photos of the job Fred helped me with and will try to post.  On that project some of the speakers are mounted up under the eaves and were painted to match, and some of the speakers were mounted on steel posts set into concrete.

One of the subs was recessed into the side of the Cabanna, and another sub was located on a formed concrete slab down near the pool.

After the first season, all the speakers placed down in the landscaping were concealed by the plants and the speakers under the eaves blend in well because of the paint.

It's an impressive sounding outdoor installation that's very clean sounding even at high SPL and provides bass that you can feel over a large area.