Cloudflare APO on Root and Subdomain

Hi!

My main domain is located at www.domain.com and my shop page is located at shop.domain.com (NOT MULTI-SITE).

Do I need to enable Cloudflare Plugin (to use the APO) on both domains? Or I just needed to install the Cloudflare plugin on the root domain?

I noticed that when installing APO on both domains, if I update on the subdomain the root domain cache is also being cleared. That’s why I am confused.

Thank you.

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