Unfortunately in Plooto to be considered Admin you automatically get Approval Status.
As the Firm taking care of a client's books you may not want that responsibility.
Current Workaround:
Set up your company with an email address just for Admin functions, and create separate ones for you and your team as Users, using the Accountant or Custom classification in Plooto.
So the company admin login should be used only to set everything up in Plooto and to manage your team and Client access. Then use the secondary Users to set payments up for approval. If you as Admin sets up a payment for approval, youare in fact approving the payment, and if only one approval is required the payment process has already started. Something you definitely don't want to happen.