thank you, you might be the first user I've read who reported it as working fine
every other places I've found, the users are afraid of doing it and suggesting everybody not to do it. (while even Sony is explaining on their website how to do it)
I don't know if you can set one console to be the "main" for multiple account, but I guess we should prevent doing that. that's probably what bans people.
and like said above, don't use more than 2 consoles with your account at the same time.