Officially, cards up to 200mm in length and 2 slots fit in the case. Power consumption up to 150W.
Unofficially, there is still a bit of room. So up to 205mm is still possible, I think. My card also has 165W and also runs.
To 2) no. You only need a notebook/computer with thunderbild3 connection, the graphics card is installed directly in the box, and the box is connected to the computer via tb3.