Yes, they are made of aluminium and designed to be weatherproof for permanent outdoor use.
Flexible connection and external tensioning system are designed for a freestanding, ground-mounted setup; the difference lies in how you tension the sail. The wall-mounted version is specially designed to be fixed to a façade or wall.
Anchoring (ground anchor, concrete base, wall plate...) is sold separately and can be found on our anchoring page.
The angle determines the slope of your shade sail. An 80° angle provides better water drainage, while 90° gives a straight, tight setup.