The designs are almost equivalent to the ones for Company Overrides.
But they have some simple but important differences:
If the customer has no association with neither Clients nor Companies, the Override buttons are not present at all in the Customer edition form.
If the customer is associated to Clients, the behavior is exactly the same as for Companies.
If the customer is associated to a Company:
The modals have at the beginning one more field with label "Tier". This field is a dropdown with fixed options: "Client", "Company".
When the selected tier is "Client", the second field behaves the same as for Companies.
When the selected tier is "Company":
The second field as the label "Company" (instead of "Client"), and its suggestions are the available companies.
The grid shows an additional column at the beginning with label "Tier" and the selection of the tier type on each row.
The second column in the grid shows the label "Client/Company" and its filled with the client or company selected on each row, depending on the tier type.