In my area, I'm on the river so there is no thermocline per se. I run free floating jug lines. I start with 9 feet of line. By the time I tie all my knots, it's more like 8 feet or so.
If there is lots of current I deploy my jug on the shelf. Most people call it a flat, more like a ledged flat. If there is not so much current I'll deploy more in the middle of the channel.