I'm considering making a Pi cluster (Let's say 8 Pi 3s), and instead of buying an 8-port USB charger and 8 USB cables of exactly the right length, could I use a powerful enough (8A?) 5V wall wart and then hookup wires to plug it directly into the 5V header on the GPIO on each of them. Would this be safe electrically and not damaging to the Pis, and if not would there be a method to make it so? Or is it best to do it the 'normal' way?
Thanks