Only use one Amazon capsule per article, and make sure the product in the capsule is a vital part of whatever you're writing about.
Also, your article must be long enough to justify using the capsule. Putting it in a short article will almost always get a flag.
I have two articles with Amazon capsules in them right now. One is a recipe for vegan tamales. The Amazon product is the organic masa I like to use. The other article is about creating rusting plates, and the product in the Amazon capsule is a book about making things with rusty items. Both articles are quite long, and don't contain any other promotional materials.