To simplify rulesets, you can combine interfaces into Interface Groups and add policies which will be applied to all interfaces in the group.
Since interface groups are processed before normal interfaces, you should not have issues with overlapping rules in the interface tabs itself. More details about processing order can be found here
Settings
| Name | The technical name of the group. Has some restrictions which also apply to the underlying operating system. |
| Description | A user friendly description, informational use only |
| Members | Member interfaces |
For a deployment strategy visit Security Zones