Let's Encrypt and CloudFlare SSL / TLS encryption mode

Hello! What encryption mode should CloudFlare use (Flexible, Full or Full {strict}) if the site uses the Let’s Encrypt certificate activated in the HestiaCP panel?
In what mode will the automatic reissue of Let’s Encrypt certificate work?

For hestiacp.com we use full, which works also perfectly for renews. Probaly strict would also work.

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