You do not need “approval” you only need to notify them either with the link above or a phone call. That’s only if your are less then 5 miles. If your close to a helipad then it’s a good idea to contact them and let them know.
New to this forum and looking to buy a Spark to go with my Phantom 4 Pro and Tello. I fly a Coyote Basin Park Beardsley/Cave Creek Rd. when I can't get out of town. City of Phoenix has ok'd RC aircraft there. The tower crew at Deer Valley Airport are always very nice when I advise them I am flying. I am always looking to take a Saturday or Sunday road trip to find interesting places to fly and photograph.