In the past Dragon Age games we've seen a great variety in Elven origins, giving us a perspective on how other races treat them and how they in turn are treated by other Elves.
You have City Elves, the bottom of human society, who simply struggle to live peacefully with humans, taking some elven bits with humanity in an attempt to coexist. But they are always at the mercy of humans, and those can be very cruel mercies, when your life is deemed to have less value than a human.
You have Mage Elves, somewhat more privileged, they receive, education, accommodation and training in their powers. They may be locked up in a Circle, but their magic makes them invaluable and they aren't starving in slums and Alienages. But now they have to deal with a religion which not only persecutes because of what they are but also who they are.
Then you have Dalish, which can vary widely depending on your clan, you can be human tolerant, xenophobic, a bit arrogant and condescending and more often then not isolationist. They understandable, just want to be left alone, and who can blame them. But the Elven lore and history they value, is so distorted and misinterpreted, that the truth has been almost forgotten.
So in Tevinter chances are high, if we play an Elf, chances are we will be a City Elf/Slave. Where we stand in Tevinter society might depend on our class, it seems the most likely outcome. Dorian himself mentions that Dalish don't tend to go north to the Imperium, understandably.
Although I do wonder why does Tevinter seem to have such a high demand for Elven slaves, if the comics are any indication they seem to be highly valued or sough after. Why? Are they simply better suited for slave work or expendable?