Parallel approval in PO in Position hierarchy

We are in 12.1.3. . Purchase Order approval  has been designed to follow Position hierarchy. We have a requirement  as follows

For a specific scenario - need the approval notification to  be sent to two persons ( parallelly) .Believe with  Position hierarchy  Notification will be sent only to single person eventhough the position contains multiple holders (it will be sent  to first person in the alphabetical order). With AME  Notification can be sent parallely to multiple persons. Is there a way to achieve  parallel notification with Position hierarchy.

Thanks

Jagan