[mothered]

I have my main Amazon account that is aged and has hundreds of purchases on it. I have recently performed one DNA on it for an item that was $450 but I don't want to push my luck and get my account or address blacklisted.

Here's a non-exhaustive list to take on board.

• Allow a sufficient gap between each SE (to play It safe, 6-7 weeks from one to the next)
  
• Perform legit purchases In between SEs (self-explanatory)
  
• Alter the value of the Items (hit low value Items every now and then)
  
• Don't use the same method In succession (no need to explain this)
  
• Give the SE a break for a while (stop for a couple/few months and repeat It every so often)
  
• Don't always refund (throw In replacements to break the same pattern of behavior)
  
• Keep chargebacks and PayPal disputes/claims to a minimum
  

How many orders do I need on a fresh account to pull off a successful DNA for an item around $500?

Make a couple of legit purchases prior to the DNA, and repeat the process with each subsequent SE.