Start 2 instances of ftp-proxy one for ftp one for reverse proxy

Hello,
I'd like my firewall to start two instances one for ftp proxy and one for ftp proxy.So far I have in rc.confftpproxy_flags="-D7 -v -p 8021"

I can run manually/usr/sbin/ftp-proxy -D7 -v -R 10.1.1.1 -p21 -b 3and the reverse proxy works
But I would like these to instance to start automatically
I tried this but it didn't workhttp://misc.openbsd.narkive.com/Highrohk/multiple-instances-of-ftp-proxy
Thank you