Best practices for Repeating Alerts until Acknowledged

So looking at the example, this should work, right?

  garage_door:
    name: Garage is open
    done_message: Garage is closed
    entity_id: cover.garage_door_opener
    state: 'open'
    repeat: 5
    can_acknowledge: True
    skip_first: True
    notifiers:
      - notify.ios_my_iphone