This KB goes over how to conduct a silent install on multiple clients from central IT for 5x. Normally that is done with an .msi file and a script with parameters.
Before continuing, please verify the system requirements are met:
Solver Cloud System Requirements
Furthermore, you should be able to retrieve the Report Designer add-in install file from the Cloud web portal:
Cloud/Private Host: How to install Report Designer version 5.x
The command you need is to run the following for command prompt
<.exe fileLocation> /Extract "<destinationLocation>
So for example in the below, the Report Designer(RD) installer is located in the downloads location and will be extracted to the desktop. You can then see this in combination with a couple of switches ( /execnoui and /q ) to deploy this installer out "silently"
We have this kb article on the topic. While its 4x focused, the same concept applies to 5x.
Note that you do need to run the installer manually once.