for snapper, mussel burley is a pretty good choice too.
I don't use much burley myself because I usually drift fish with soft baits.
But some of my friends use burley bombs with good success.
If you're fishing in shallower water, less then 20 meters, it's best to tie the burley higher up - best right next to your boat.
Then the current can take it out further, with small pieces slowly sinking to the bottom.
In deeper water it's best to tie it about half way down the anchor line.
If you have leftover fish frames, mussel shells or other smelly stuff you can slowly throw it over board into your burley trail for extra attraction. Catfood is supposed to work pretty good as well and is reasonably cheap.
Once you setup a burley trail, you have to be very patient and wait for the fish to arrive.
It could take an hour or longer of constant burleying. There also needs to be a good current flow to take the burley out.
So best to be at the spot two hours before the best fishing times and start the burley trail as soon as you arrive.
a snapper a day keeps the doctor away