Redirect FeedBurner Feeds via .htaccess in MultiSite

I have been using .htaccess to redirect RSS feeds to FeedBurner, as opposed to doing it with a plugin which is slower and more taxing on the server. However, I am uncertain of how to accomplish this in a MultiSite environment. Here's the code I've been using for non-MultiSite implementations:

# BEGIN FeedBurner Rewrites

<IfModule mod_rewrite.c>
 RewriteEngine on
 RewriteCond %{HTTP_USER_AGENT} !FeedBurner    [NC]
 RewriteCond %{HTTP_USER_AGENT} !FeedValidator [NC]
 RewriteRule ^feed/?([_0-9a-z-]+)?/?$ [R=302,NC,L]

# END FeedBurner Rewrites