FCPX titles path (Paste the Extracted folder in the below path):

If you have Apple motion installed:
Users/(username)/Movies/Motion templates/Generators

If you don't Have Apple motion installed:
Right Click on the final cut pro icon in application folder and Click SHOW PACKAGE CONTENTS than open the following path-

Contents-Plugins-MediaProviders-MotionEffect.FXP-Contents-Resourses-Templates-Generators