I'm not sure what you're trying to say...
UA Hunter 3 gets you Horde Breaker, Hunter 3 gets you another instance of Horde Breaker. As long as there's two opponents next to each other, that's 3 attacks.
I thought you meant the Multi class attack + hoard breaker my misunderstanding still not a big deal you lose out on an asi at early levels realy no different if you went 6 ranger with Hoard breaker now. Later levels would be a better benifits but you still be better of going 5 ranger then multiclass to other ranger. That is if it is even allowed by the DM me personally only one Ranger Class is aviliable all normal multiclass is in play but Ranger/Ranger is not it is a Ranger alterative to the current (that is my take anyways)