Few questions

I'm looking into purchasing to play on my alt accounts, but I was wondering if there were any types of precaution I could take to not get my Main(that I wouldn't hack on) banned? Should I install on a USB device and disconnect after injection or? Any useful feedback would be very much appreciated.

USB is useless, all you have to do is following the forum daily, reading for updates etc and disconnect family sharing option between your alt and your valuable accounts