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The magnets rest on the curved part, the vents are in the right spot
Doubt it'll make much difference unless you have a nice fat MOE grip where air can actually flow around.
Couple points though; on a really high end motor, cooling isn't even that critical. The vented grip plate and open end bell should be more than you need on any rifle.
On an LMG you obviously need more cooling, BUT, high end motors can run at very high temperatures without breaking.
I've run my EF1300 on my 249 up to max temp just about every time I take it out. Grip gets right to that heat threshold between hot and burning while wearing gloves.
Motor went 4 years of doing that until the comm got covered in carbon, skimmed the comm, still running fine.
Mind you, motors with stronger magnets will draw more current and generate more heat. High torque (as in 18-24tpa) motors tend to be pretty efficient and not draw a lot. My EF1300 is a ferrite motor with what looks like a 13-14tpa armature, so a bit quick with low torque, and therefore doesn't generate heat very quickly.
FYI you absolutely do not need a lot of torque on an LMG when you're running 26:1 gears.
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