Single Pane of Glass for multiple FortiSIEM installations

I have a scenario where I have 3 different FortiSIEM installations. What is the best way to manage those from the SOC? Having to view each dashboard seperately is inefficient. Is there a way to make one of the 3 FortiSIEM instanes the supervisor of supervisors? Or should I look at FortiSOAR? Or some other third party solution?