Can you add a deck Arbor to an existing deck?

I want to put an arbor on my existing deck. Can I put the 4x4's on my current railing with decorative support braces? I ha e seen these braces in the past but can't seem to find information about them now. I also want to know how many 4x4's per ? Feet. My railing is 13 feet long and it has 4 4x4 posts in between it. How many braces will I need?
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