When I tamed my first giga, I used 6 metal Dino gates, in a 2 by 4 formation. Turns out u only need 4. Once tamed, it had 25% melee🫠🫥 and I realized Gigas have horrible stam and stam recovery. Make sure to bring about 200 narcotics and tranq darts, and longneck, 2 large bear traps, and at least 4 metal Dino gates.

Good luck!