What's the best way to install XFCE extension?

I am completely new user to Qubes and would want to make things right from beginning.
I know xfce extension should be installed in dom0 but there is no docs about how to install such extensions.
Basically I want to install this extension: Carsten Orthbandt / shinglify · GitLab
Is it possible? If so, what’s the best way to do it?
Thanks for your assistance.

You can already do pretty much all the extension does. Workspaces are available by default, if you drag a window to a corner it’ll be resized automatically, and you can set keyboard shortcuts in settings.

It sounds like you might be looking for this, but please note the security warnings on this page:

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