You should make something like this for def on your base

-you will first need a lot of Dino gates, ramps and pillars which are wood+

1 build the Dino gates around your base with ramps leading up there

2 tame a lot of dilos depending on the size of your base and put them on the Dino gates and set them to neutral/aggressive/attack target with range medium/high and make them not move

3 remove the ramps

4 make a outer wall again out of Dino gates and make sure they’re spread out

5 add some turtles or another tanky and easy tame Dino and put them in between the Dino gates

Boom! You have a cool and effective def