Just to add a small practice we follow for similar round parts at the parting line..
We will add a small draft value ranging from 3-5 degree, so that the unavoidable zero draft region due to perfect circular geometry near the P/L can be eliminated, possible drag mark will be prominent on plastic parts if not done this.. For symmetric geometry you may think of modelling one half and mirror/pattern the second to save time I guess..
split surfaces and apply draft twice.