Yep, you can, in fact, do that.
The reason a number of people say it doesn't work that well is because the built in emitter on the TX isn't amazing - you might be better off buying three of the T's, and picking up the 3d vision kit separably.
That being said, a single 690 isn't going to be able to do what you want from it, because it doesn't have enough graphic memory - though it advertises itself as being a "4GB" card, each chip only has 2GB, and VRAM doesn't stack in SLI.
I've seen a few people who have run it with 2GB cards, that shouldn't be an issue, especially since he'd have to go without AA and turn down a few settings for smooth game play. 3D doesn't add much vram usage, if any. It isn't much different than any other AFR setup, as each card just renders a different frame like normal AFR.
It is good to know about the TX model combination. I've been wondering about that.