Discuss the supporting wall, equipment location, access points and the parts of the boundary that need assessment from both properties. Arrange permission for any required neighbouring access. The HOA process and technical assessment serve different purposes: both need to be addressed before work is agreed, without asking a neighbour to decide technical compliance.
If the present fence has defects, electric fence repairs can be priced alongside the proposed addition. Ask the quotation to distinguish necessary corrections from optional changes. At completion, request an explanation of normal operation and how to report a warning. Keep the approved route, completed work and certificate together for future ownership or maintenance enquiries.