One landing page can be enough for a CPA affiliate marketing campaign if it is optimized properly. You must ensure that the page is clear and directly focused on your offer. A well-designed landing page can convert visitors into leads effectively. However, testing different variations and targeting specific audiences can improve results. You need to test headlines calls-to-action and layout to find the best combination. While one landing page might work initially expanding and testing additional pages may increase conversions. Monitoring performance regularly is crucial to understand if you need more than one landing page.