I can't comment much on gaming since the last game I played (and still play on occasion) is Diablo 3. Definitely not an FPS person.

Looking at your the D2T specs, it's 650 centre-to-centre. Using the dimensions for my 34" and 27" (shouldn't be too vastly different, plus weight limit is 10kg per arm, so you should be fine as long as you use a relatively new monitor), and assuming you're doing

27" Vertical - 34" Horizontal - 27" Vertical

that'd be

368 | 807 | 368

taking the middle of the monitor to be where the vesa mount is at

184 | 403.5 | 184

So 184 + 403.5 = 587.5 < 650

That still gives you some wiggle room. r/theydidthemath

With the length (which now becomes the height after you turn it vertical) being 612, and taking the vesa point to be in the centre, height to accommodate is 306. Range of your mount is 200-360. So should be manageable I think? The question is, how high do you keep your monitors at now? Since it seems the mount fixes the height for all three monitors.

Oh as a side note, I'm using my 27" in portrait on it's original stand. Since I prefer to have the screen closer to the bottom. Having it like this kinda eliminates the need for a secondary arm. Initially was considering the NB H160 for either a stacked or side-by-side but I think I'll hold off for something else since a kind user have reported having another monitor stacked would make the primary screen sit a bit too low for my liking.