This article explains how to apply CLI configlets on multiple devices from Junos Space.
Starting with Junos Space 13.1 or later, CLI configlets can be applied on multiple devices.
Select Network Management platform.
Select CLI configlets->Configlets.
Create a configlet. When creating a configlet, you must select the radio button for Grouped Execution as the Execution type.
The above steps will help to push a single configlet to multiple devices.