"How to realize that" question

Hi everyone, I launched a review website recently and while was looking through my competitors in the niche found this one guy https://www.talkaboutsleep.com/. If you press any link from that website pointing to Amazon you'll get to .uk,.de etc. zones, depending on your current location. And I bet that thing boost conversion rate a lot, so my question is about how it can be realized. I was told that when you're becoming approval from amazon to participate in an affiliate program they provide you with some solutions like that. Probably that's the thing, but I am not 100% sure