Sagrods are quite common with projects that includes Purlins, most of the time you would need to insert these elements in multiple locations. The video below will show you how you can make use of the Block Centre to insert the Sagrods. This is just one way on how you can do it. A copy command is also an option.
User have modelled Sagrods with the connection plates and would like to place it on multiple locations. See video below as one of the suggested options on how to insert Sagrods on multiple locations.