The Persian Gulf area is tailormade for these boats or similar types. There is ample Iranian coastline to shelter and even fuel from, and with the worlds most important shipping lane within touching distance long legs are not needed.
In such an environment i wonder if some dozens of cheaper AIP boats may be more useful than 10 expensive Virginia class boats at something like $2billion each.
And remember, these Gotland class are old boats, the new German U212 class are better.
Diego Garcia would be an ideal sub base for US SSK's covering the Indian Ocean, Suez Canal and Persian Gulf.
I'm sure Tarawa, Guam or Iwo jima would be good for the Western Pacific as well.