What I want to do is look like the image above.

In fact, I posted the same question about Blender 2.79

In the meantime, i have heard static override of the 2.8 version.

But today I tried one collection multiple linking & make proxy in Blender 2.8 and it failed.

I tried to create a separate proxy for the linked objects, but all the objects are controlled by the last proxy I've created.

What did I miss?