No, as a standard rule, you must not implement the same ad format (and its corresponding ad tag) more than once on the same page.
Doing so will cause significant display errors and negatively impact your financial performance by diluting the revenue for that ad slot.
However, a specific, designed exception exists for the Medium Rectangle and Megabanner formats.
There are two primary reasons why duplicating a single ad tag is prohibited:
Ad Rendering Issues: Ad units that share an identical tag ID will not render correctly. They will often be displayed "stuck" together or in an unintended location, which degrades the user experience.
Revenue Reduction: Our advertising partners can detect the number of times an identical ad ID is present on a single page. If an ad tag is duplicated, the total revenue generated for that specific ad slot will be divided by the number of times it appears, resulting in no financial gain and poor performance metrics.
An exception is made for the Medium Rectangle and Megabanner formats. These formats are available in two distinct versions—a "Top" tag and a "Bottom" tag (e.g., "Medium Rectangle" and "Bottom Medium Rectangle").
This structure is designed to allow you to place these formats twice on the same page (e.g., one at the top and one at the bottom) without conflict, as they use separate, unique ad tags.