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test it yourself?
place the macbook upright in clamshell mode as you would with the dock and see if it affects the temp for you. If it doesnt, neither will the dock.
 
Henge says this about their product and cooling, it's on their website in the FAQ.

Are there any problems with running my computer vertically in the dock?

No, in fact we've noticed some positive side-effects to running the computer closed, vertically. The computer will run cooler and faster since it only has to drive one external display, as opposed to running it open with an internal and external display. We spent over a year testing the docking system in every conceivable circumstance and observed no performance decrease even under hour long CPU load tests. We've heard some claims that the CPU runs cooler in the vertical position, but we have yet to document any appreciable difference. The case, however does tend to stay noticeably cooler since more surface area is exposed to the air.
 
The real question to ask is "does it cover the left side of the display hinge." That's where most of the heat produced by the machine is vented, open or closed (there's a dGPU heat sink on the other side, but the CPU is likely to heat up more often). From the image it looks like it just barely covers the very left edge of the hinge, probably less than an inch. Seems to me like it should be fine.
 
That covers the CPU side of the MBP with plastic, it will certainly heat up a little more.
 
The real question to ask is "does it cover the left side of the display hinge." That's where most of the heat produced by the machine is vented, open or closed (there's a dGPU heat sink on the other side, but the CPU is likely to heat up more often). From the image it looks like it just barely covers the very left edge of the hinge, probably less than an inch. Seems to me like it should be fine.

That covers the CPU side of the MBP with plastic, it will certainly heat up a little more.

With the Unibody MBPs, whether it's 2010 or 2012, there are no fans or heat pipes specific to the GPU or CPU. Both fans operate in unison and both heat pipes pull heat from both the GPU and CPU heatsinks, which are in a fore/aft position in the center of the logic board, not a left-right position.

The rear of the dock may cover part of the fan vent, but due to the orientation of the laptop it shouldn't be an issue (Heat rises).

As for covering the "CPU side" with plastic, the dock doesn't cover any part of the case where the CPU is located and, in fact, offers more uncovered surface area for passive cooling than when sitting flat on the desk.
 
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