The issue of multiple triggers on the same sObject is a code quality issue, not a security concern, so it doesn't need to be addressed during the security review process. However, you should document this as a false positive in your submission to provide clarity to the reviewers.
The scanner might incorrectly identify issues due to code quality concerns rather than actual security risks. To address this, document such cases as false positives in a False Positive document, explaining why the flagged code doesn't violate security standards.
The "multiple triggers on the same object" violations usually occur when there are multiple triggers defined for a single object, which can lead to issues like unpredictable execution order, performance problems, and maintenance challenges. To avoid this in general, it's best to consolidate logic into a single trigger per object and use a handler class to manage the logic for better organization and maintainability.