I just put a 2TB 990Pro into a Dell Latitude 5411 with its dinky "Thermal Support Bracket". However, I took the time to do a little research on safe temperatures.
(It runs a similar mid-high 60s under load)
-68c under full load is 'fine'.
AFAIK, >70c is typ. where you should start to worry.
If you do want to run it cooler, you could pick up another laptop manufacturer's M.2 2280
cooler (and snip off its proprietary mounts, if interfering. Rubber band, etc. for retention.)
Example, Dell's stock M.2 2280 $6 "Thermal Support Bracket":
Dell OEM Latitude 5400 / 5500 Thermal Support Bracket for M.2 SSD - 85J62 085J62 ET2FB000310. 85J62 085J62 ET2FB000310. LOC : K53(AMC03. Dell OEM Latitude 5400 / 5500. Thermal Support Bracket. DELL P/N ).
www.ebay.com
Note: you'll need thermal pad / putty,
unless you find a different-similar option that comes w/ fresh pad. Like, this $7.69 option:
Find many great new & used options and get the best deals for Heatsink For Dell Latitude 5400 3540 3541 5500 5401 SSD Cover Bracket X3DN4 at the best online prices at eBay! Free shipping for many products!
www.ebay.com
OtoH,
spreading the thermal load out over more mass of the drive, is another cheap and
0-profile option.
In my experience, 'copper graphene' foil heat spreading material, does actually work. It's acts like a flat heatpipe/vaporchamber, quickly conducting heat away.
note: I've only used the 'bulk' electrically conductive stuff.
Introducing JEYI's graphene heat sink, the perfect cooling solution for your 2280 M.2 solid state drive (SSD). Our heat sink features a unique dual-layer design, with high-quality graphene material on one side and a layer of copper foil on the other.
www.ebay.com
It won't actively 'dissipate' heat, but it will spread it over the mass/area of the drive.
Since, you're already w/in safe temps, you don't really need too 'heavy duty' of a solution.