Download the module and modify ROOT_PERFMONstub.ps1 - out of the box it lists just the current server. You will probably want to add more from one of the inventories. Contribute more on Github.
This module expects the Bell framework to run under an account that has enough permissions to access other servers using WMI.
For every server, you get a list of categories and subcategories. At the 3rd level of the counters, you get a list of instances with their current values. (some branches contain so many instances that the script stops sampling after 15 instances to save time). By clicking on a specific instance, you get monitoring results for 30 seconds (1 second sampling interval):