Yes, there are two separate strips of 3" flexwatt in the CB70 racks.
You only need one probe. Plus both strips into the Helix. They are set up identically, they will operate identically, they just provide a bigger surface area of belly heat when you use two strips.
As far as the probe goes, put it directly on the tape, near the edge of the rack, like an inch in, so that it doesn't interfere with the tub sliding in and out. If you need a picture let me know I'll put one up, I just don't have one handy at the moment.
I'd be more than happy to talk you through if need be as well, all we use is RBI racks and have nothing but positive experiences with them.
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