To find the categories of peer products on Amazon, follow the steps below:

1. Go to the Amazon website and log in to your account.

2. Enter the product name or keyword you want to find in the search bar and click Search.

3. On the search results page, select a product similar to yours and go to the product details page.

4. On the product details page, find the "Product Information" column, which contains the "Category" information of the product.

5. Click on the "Category" information to view the category of the product.

6. If you need to view the categories of other peer products, you can repeat the above steps, or use the filter on the search results page to select the corresponding category for search.

Note: Amazon websites in different regions may be different, and the above steps are for reference only.