The Dolphin 2 class consists of two submarines delivered and one (INS Dakar) on order:
The Israeli NSA would be co-located with the IDF's command, communications and all source military intelligence functions. All of them within Tel Aviv's IDF HQ at HaKirya. As aficionados of SigInt know SigInt is all about targeted collection and computer processing all serving customer analysts.
The Israeli NSA's main target would be terrorism. Russian operations (including Tartus) over the border in Syria would be another major target. Close relations-sharing with other NSAs are likely.
Here is an interesting February 12, 2016 article on Israel's Dolphin submarines, their weapons, other specs and operating/transit issues: http://www.globalresearch.ca/israels-nuclear-armed-submarine-fleet-in-mediterranean-threatens-europe-and-middle-east/5507364 .