When using a double hook trace, yes. Then they hook one hook behind the head and one above the tail.
But then again, it is usually done with your bigger mullet and THEN you would rather slide them out than cast.
Those 15cm jobbies will work nicely with a single hook.
Send a PM to Kaspaas and ask him for a copy the SSEC:WC Kob Clinic CD. It costs R50 and it gives a nice breakdown on traces and bait presentations for catching cob.