Help with targeting threshers?

Headed out with some buddies, looking to target threshers. Now that the prime grounds by the pier are "closed " what's a good place and technique to try and catch one?

I've seen a few chase my rock fish to the surface around the winter grounds, so that's where ill most likely go unless someone has a better idea.

Where in the water column is The best place to hold the mac?

I was thinking of one on the bottom and one about 1/3 of the way up whatever depth I'm in.
Any help would greatly be appreciated.

Neill