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The phrase "two primary types" is correct and usable in written English.
You can use it when you want to refer to two categorically distinct groups. For example, “There are two primary types of galaxies—spiral and elliptical.”.
Exact(44)
Athletic shoes have two primary types of traction.
There are two primary types, arabica and robusta, with arabica widely considered to have the finer flavour.
By the early 2000s most firewalls were hybrids of these two primary types.
There are two primary types of acidosis: respiratory acidosis and metabolic acidosis.
The two primary types of lymphocytes are B lymphocytes and T lymphocytes, or B cells and T cells.
There are two primary types of wind turbines used in implementation of wind energy systems: horizontal-axis wind turbines (HAWTs) and vertical-axis wind turbines (VAWTs).
Similar(16)
The overlap of three primary types of annotation is examined.
Three primary types of evaluation are formative, process and summative.
The KidZui browsing experience is very graphical and consists of three primary types of content: websites, photos, and videos.
The three primary types of services include data services, utility services, and functional services.
The heavy oil distributions are classified into three primary types, based on which the corresponding acoustic velocity models are given.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com