all ? Need some help understanding it

I have a table on my report with a list of site :

A measure name "score" exist on this table calculating a score from 0 (bad) to 10 (best) based on 5 different other table connected to this one (through ID)

My use has some filter so he can filter all the pages of my report per company and/or site

Then I have a ranking measure (to have a ranking per site).

I want to build it using "all" so then the user filter a site the ranking is not affected.

For example, Site A (part of company 1) is the site n°10 global and the 2nd site of its company

I want the ranking of the site to always be 10, no matter if the user filter company 1 or only site A

First I tried simply using "all" has its description says it remove every filter on the selected table :

Site ranking = RANKX(all('Site List'[Name]),[Score])

But if I filter on company 1, site A ranking become 2. If I filter only on site A, it become 1 (logical has there is only 1 site)

Then I tried to add some more element to all ;