Deny Proxy Server from Accessing Ask a Question Page on Easydiscuss

Hello,

I was a Old member - dont have existing subscription
Still - would appreciate - if for benefit been a user of your softwares - can assist in on below query

Some Bots / users using Proxy Server flood in by submitting question as guest user
I have found this code by searching Online to stop in flooding attacks through proxy servr

<?php if(@fsockopen($_SERVER['REMOTE_ADDR'], 80, $errstr, $errno, 1))
die("Proxy access not allowed"); ?>

This has to be added in header. i dont want to use it in template file - as would unncessary cover in all the pages. Could you advise in in which files of easydiscuss software & lines should i add in above php code in easydiscuss so that Proxy users can not access in 'Ask a Question' page having this url

index.php?option=com_easydiscuss&view=ask&category=1&Itemid=10

Would be glad to seek your advise on it

Many thanks