Apache: Redirect all Let's Encrypt challenges to a single document root

le.conf

<IfModule mod_proxy.c>
        ProxyPass /.well-known/acme-challenge !
</IfModule>

Alias /.well-known/acme-challenge /var/www/html/.well-known/acme-challenge

<Directory "/var/www/html/.well-known/acme-challenge">
    Options None
    AllowOverride None
    AddDefaultCharset off
    # Apache 2.4
    <IfModule mod_authz_core.c>
        Require all granted
    </IfModule>

    # Apache 2.2
    <IfModule !mod_authz_core.c>
        Order Allow,Deny
        Allow from all
    </IfModule>
</Directory>