make sure your safe site is high quality, and relevant to your ads title and keywords. If the website is not semantically relevant, your ad probably wont be approved. If it's indeed approved, it will not last long because google can measure bounce rates and many other users' behavior signals. So, for ex, If people are exiting your safe site too fast, it triggers a red-flag.
These are preliminaries, before even using a cloaker. Google, nowadays, is focusing on users' behavior on site to determine the likelihood of real ads/business VS not.