I have two Turbo k’s.
I run one with a DA Keymo adapter and the other goes between Q and Griffin armament mounts.
For your first can I would do a .30 cal YHM modular can (Resonator or Resonator K).
That will allow modular mounting and let you shoot 308/ 300 BO and 5.56.
5.56 dedicated can is better as a second can.
If you are stuck on 5.56 cans, the YHM turbo K or the T3 is the way to go.