I've been useing two regulators straight to the reciever with two lipos plugged in direct to the regulators with deans connectors
useing this on three different planes with hundreds of flights no issues

I also got into the habit on the first flight of pluging in one pack.... unplug it.. then plug in the other.. then plug them both in

that way I'm sure the regulator is working.. if I just plug one in then the next I have no way of knowing the last one is on