Yes, you can add it to BPS Custom Code in this Root Custom Code text box: CUSTOM CODE BOTTOM HOTLINKING/FORBID COMMENT SPAMMERS/BLOCK BOTS/BLOCK IP/REDIRECT CODE: Add miscellaneous code here
Click the Save Root Custom Code button, go to the Security Modes page, click the Create secure.htaccess File AutoMagic button and activate Root folder BulletProof Mode again.