Restricting Autoapproval of PR through AME

We are 12.1.3. We  have  defined Dynamic SQL for getting  the approver (  Dynamic approver ) group. We validate whether the approver is active employee or not. Suppose if the requisition have to go for three levels and found an  approver (Inactive Employee) at level 2, then  It gets approved  auto approved through requester only . Need following clarifications

1. In the above case ,if there is an Inactive employee found in any of the approver level (in this case2)  can the approval process  be stopped and No approver  found information  be sent to  requester.( any Set up change required)

2. We dont want  the requisition to get self approved. Following  is the current setup.let us know if any additional setups to prevent  self approval or prevent  requester approval