Where do Amazon PPC ads appear?

Amazon PPC ads appear in the search results for their related keywords, on the product detail pages (product page right column or bottom of the page), and Sponsored display ads and Sponsored video brand ads also appear on the off-Amazon sites.

Amazon PPC advertisements can be found on the product detail pages in the search results for related keywords and on sponsored display and sponsored video brand ads on websites other than Amazon.com.

The PPC ads results shows in the search terms of the keywords you have targeted in the PPC campaign, also its shows on the product detail pages

The ppc ads for your product will be shown on the search result of the amazon.com when you will use the specific keyword of your product

It depends on your Ad Type and your targeting strategy. If you have selected Automatic Targeting then Amazon will automatically show your product on some ASINs or Keywords and if you have selected manual targeting then your product will likely be shown according to your targeting method whether that ASIN or Keyword.