create-t3 questions

should i have the create-t3-app installed globally? (-g)?

i already have a git repo thats empty, i want to use t3 inside of it but without making a sub folder for my project
when i run the command it says i dont have create-t3-app installed
so i installed it but then it made a node modules inside of my root
then when i ran the command to create it, it made a sub folder with another node_modules and then my app
i jsut want it to be in my root any idea how i can do that
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