Happy to help explain your options. From the natural Shopify Admin, we're only able to have one automatic discount enabled at a time. With the conditions that are available, it won't be possible to ensure your customers buy two of the same product in order to get the discount since this would require making a separate automatic discount for each product.
The best way to achieve what you're looking for would be through the use of a discount app from our App Store. Some recommendations to check out are:
You can also try searching "discounts" in the app store for some more options. I understand wanting to set more than one automatic discount at the product level, and just so you know, I've submitted some feedback on your behalf to our developers about this feature.
Please let us know how this goes, and if you have any questions!