Alternate approver table

Summary:

The hierarchy configured is Primary manager hierarchy and VP is the highest level up the chain.

'XYZ' consultant needs to provide compensation recommendations for VP and 'XYZ' consultant do not come in the primary manager hierarchy.

I am trying to set up an alternate approver table for this as below

Under preview section

worksheet manager - whose name i should provide ? - employee (Say emp A) one level below VP or VP itself?

Alternate approver

worksheet manager (emp A) - sequence 1 - name of the person who will be acting as alternate approver (i.e. 'XYZ' consultant ?)

Q is how system will take this 'XYZ' consultant as approver if its not part of primary manager hierarchy?