Set up AWS Budgets in the organization's management account, specifying EC2 running hours as the usage type and a daily period. Set the budget amount 10% higher than the 30-day average EC2 usage reported by AWS Cost Explorer, and configure an alert to notify the architecture team when the usage threshold is exceeded.

Establish AWS Cost Anomaly Detection in the organization's management account, selecting AWS Service as the monitor type and applying a filter for Amazon EC2. Set up an alert subscription to inform the architecture team if EC2 usage surpasses 10% of the 30-day average.

Activate AWS Trusted Advisor within the organization's management account and configure a cost optimization advisory alert to notify the architecture team if EC2 usage increases by more than 10% compared to the 30-day average.

Deploy Amazon Detective in the organization's management account and configure an EC2 usage anomaly alert to notify the architecture team if Detective detects a usage anomaly exceeding 10%.