Securing with stainless steel strap is common, here is what you need to know:

1. If you can see the ocean, you need a high grade stainless, minimum 301-304 stainless steel strap.  Generally the higher the series, the more corrosion resistance.
2. You can secure it by punching or drilling a hole(s) and bolting it to your lumber/concrete footing.
3. Many communities have engineering departments that will tell you exactly what strap size and thickness (1 1/4″ x .030″ is most common) to use.  Which fasteners, and the number of stainless steel straps to use.