Multiplayer Free-for-all?

I'm new to 40K and want to try playing with my group of friends.

From my understanding, 40K is primarily played as a 1v1 or maybe 2v2 game. I was wondering whether there were rules (official or community-made) for running 3- or 4-player free-for-all games.

It seems like it would mostly work within the rules, but I'm not sure how Command Points and the Fight Phase would work with more than 2 players.

My interest in being free-for-all vs two-headed-giant is the element of strategy and politics it brings (like Commander in Magic: the Gathering)

Thoughts are appreciated!