If you can add sources, photos, or biographies, add siblings, children, aunts, uncles, etc., or improve the profiles of these prime ministers or their family members in other ways, so much the better!
If you run across an unsourced profile which is already on WikiTree and add one or more sources to it, you can count that source towards Sourcerers Challenge, if you're taking part in that. (And, if you happen to find an additional connection path for a prime minister whose family you're working on, that makes them all the better as a relationship finder!)
P.S. I'm not a WikiTree Leader, and have no authority to assign points, credit, or anything like that. My intent with these challenges is for them to be a fun little break from whatever you're doing regularly. (Well, that, and preparing lists of different kinds of notables for the Relationship Finder Quick Links page.) There's no time limit, there are no prizes, and if you have fun finding and adding relatives, then you win. (And WikiTree wins in any case, because the more connected profiles we have, the better the tree is for everybody.)
That said, if you manage to connect any of the profiles listed here to the main tree, there's no reason that you can't count that connection towards the Connectors Challenge, if you're taking part in that. (Or, you could count it towards the Sourcerers Challenge if you run across an unsourced profile which is already on WikiTree and add one or more sources to it.)
P.P.S. If this challenge intrigues you, and you think you might like to try finding great-grandparents for other notable people so they can be added to the Relationship Finder Quick Links page, you can find other threads in this series on the How to increase a country's presence on WikiTree page.