You can parametrize Automation Principal to different Servers using server property.
In Role, If you navigate Agent ACL --> Windows, There are two option to specify Automation Principal.
1. Map to Specific Automation Principal
2. Use Property
With 2) Option; If Server doesn't have Automation Principal (AP) defined in Property then it will fall back to User privilege Mapping (UPM). Also it allows you to choose different AP for different Servers.
I hope this will help you to meet your requirement.