Limit user connections per ip from Nginx or Csf?

Hi

I am thinking to limit user connections on server per ip in case that someone run a siege benchmark on my server and maybe try to kill it (too many connections) or in general try to use many connections from a single ip but i am not sure which is the best way to do it ?

Nginx level or Csf level?

Nginx level will react faster as it will block or add it at wait stage but csf after a minute if the site is up will block the ip.....

And what number to use for for a forum about?

Thanks

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If i want to change the limit to 50 connections on :

limit_conn limit_per_ip 50;

do i have to change also this 16 value to 50?

limit_conn_zone $binary_remote_addr zone=limit_per_ip:16m;