Multisite network

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I want to build a multisite network out of an existing wordpress installation.
Can I enable this plugin network wide?
These are my settings:
define(‘WP_CACHE_KEY_SALT’, ‘mykey’);
define(‘WP_REDIS_SELECTIVE_FLUSH’, true);
define(‘WP_REDIS_MAXTTL’, ‘300000’);
define( ‘WP_REDIS_OBJECT_CACHE’, true );
define( ‘WP_REDIS_USE_CACHE_GROUPS’, false );