Setting canonical URL for WordPress site

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I’m helping someone with a WordPress site who is concerned because users typing “www.domain.com” cannot find the site; it was originally built on non-WWW.

I understand this can be changed in WordPress General Settings, but when I do so, all site pages are accessible via BOTH WWW and non-WWW; it would seem that Google would frown on this as duplicate content.

The installed SEO plugin (AIOSEO) evidently does not allow the setting of a site-wide canonical URL–only at the individual Page/Post level.

Can I simply insert the following code snippet in the site header, to redirect ALL non-WWW requests to the canonical WWW URL?

<link rel=”canonical” href=”https://www.domain.com/” />

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