Do you want to make the sundew the focus of the terrarium?
What else do you have planted in the tank?
While a terrarium is probably the best place for Drosera as it minimizes the need to constantly monitor humidity for Drosera species alot depends on the point of having the plant in a terrarium in the first place. You can literally use any kind of safe container that is clear enough for visibility to house Drosera.
I prefer seeing them in colonies rather than just one plant as it makes a better show.
So maybe the question should be: Is this terrarium the best one for my Drosera?