The one bit of advice I have regardless of gear is to practice and know your gear whatever it is. Trying to record a stadium show the first time out isn't likely to yield much of a recording. Maybe go to an event at the venue to test security, practice rigging up, stealth a show. Years ago I lent a rig to someone who wanted to record U2. I kept telling him to do his homework and he got as far setting it up once. After the show he messages me saying his batteries were bad and recorder wouldn't turn on. I said was it on hold and he asks what's hold. He looks at recorder and he accidently turned on the hold.