You should be pointing your Apache configuration to files in
/etc/letsencrypt/live/vhost.fr ONLY. Do not use
/etc/letsencrypt/archive or other directories.
On Apache 2.4.6:
Those are the only lines you need. You can use https://mozilla.github.io/server-side-tls/ssl-config-generator/ for general Apache SSL settings.
If you wanted to use
mod_md, then this would REPLACE whatever method you used to get your certificate initially. It means you would discard Certbot and any existing certificates, because
mod_md would issue and manage the certificate lifecycle for you.
I’m also pretty sure that
mod_md only supports ACME v1 and therefore would not be able to issue a wildcard certificate, which is relevant to you.
According to the documentation, it is experimental. So, it is a risk for you to consider.
Also answered in the documentation - https://httpd.apache.org/docs/trunk/mod/mod_md.html#mdcertificateagreement