If you go without the heatsink in the laptop due to clearance (WD lists the height somewhere on their page/datasheet), you an still get one separately. Icepc makes copper ones (also copper with graphene coating) at both 4mm and 2mm of height with the latter being useful in tight spaces.
edit
Checking WD's site, the original is 0.09" high while the heatsink version is 0.35". Datasheet has this as 2.38 and 8.80mm, respectively. The heatsink version does have some height on the back/rear, though. Icepc's 4mm and 2mm options would probably be shorter.
I personally use copper ramsinks like the Alphacool 17427 or Swiftech MC14 applied directly to the controller with thermal tape. If it must be full-drive and/or low profile, icepc's pure copper heatsink - 2mm or 4mm depending on clearance - is ideal.
i never use the stock fans for either the cpu cooler or the case as performance an longevity are never good i for all my build an both my current builds i use these
noctua-case-fan-nfa14industrialppc3000pwm
noctua-case-fan-nff12industrialppc3000pwm
both are great with pressure an airflow an are not that noisy at all no coil wine just a good white noise whoosh with cpu an case custom fan curve set from the mobo they ramp up an down as needed
they do cost more then others but are truly worth the invest
i would say get them after you get all the other gear
an maybe get a different case the has more front intake an a vertical gpu mount option
id go with this one the 4000d as the 275r isnt at a good cost any more an hard to find in stock when it is 275r airflow
so for my 2nd build i went with this one just as good
heres my current build with the 275r an the stated fans
with the mentioned fans my avg temp in a 74deg room is at idle
for mobo 24 - 26c load 32 - 36c
cpu ( with noctua fan an aio ) idle 26 - 29c load 38c to 45c (1080p gaming med to ultra set)
48c to 57c for editing
my nvme's i use these heat-sinks build 1 - build 2
my temps pre heatsink at idle 32c load 40c now idle 24c load 32c