I record all of my step kids school concerts. I assume this is a spring symphonic or wind ensemble performance. I am not familar with your mics but generally speaking the battery box is the best way to go. I usually tape 7th-8th row mics about 7ft high, this puts me a little above the band. This annoys some but my tapes smoke and the band director always gets a copy and he is happy I can tape where ever I want.