Question: Do Django and his wife finally get free, or they have to hide from other bounty hunters?
Answer: Since the film ends with their riding off together after blowing up Candieland, any answer would be speculation. Obviously, it's meant to be a happy ending, our conquering hero triumphantly riding from the scene of his victory over Candie and all his racist minions. Realistically speaking, of course, there would obviously be a huge price on Django's head after the carnage at Candieland, and they are fugitive Black people in the pre-Civil War Deep South; every single bounty hunter and law enforcement officer, not to mention just everyday racist yokels who hear about a giant payday, would be looking for them. In the real world, they would likely be apprehended within days, if not hours. So, maybe it's best not to think too much about what happens next.
Answer: They get free. They have proof of freedom and there's no one left alive that would identify Django for any crime.