The whole "5 Mile from airport" portion is out the window as of earlier this year. Strike that from your data banks as basically irrelevant now.
If you want to fly INSIDE of Controlled Airspace you have (3) options...
A) Use LAANC (if the facility is currently in the LAANC system)
B) If no LAANC you would go to the DroneZone and submit for an authorization
C) If available, you can fly, for HOBBY at a FIXED flying site that has an existing Letter of Agreement (LOA) with the FAA.
"You are flying at a recreational flyer fixed site that has a written agreement with the FAA. The FAA has posted a list of approved sites (MS Excel) and has depicted them as blue dots on a map. Each fixed site is limited to the altitude shown on this map, which varies by location. "