Power for a Ring Video Doorbell Pro and Ring Video Doorbell 2

Hi, I would like to power a Ring Video Doorbell Pro and Ring Video Doorbell 2 (Battery) with 1 AC plug-in Adapter (No mechanical or digital chimes). I saw a different post where it was suggested to use a 16V 30VA transformer for 2 Pro doorbells. Multiple questions: 1) Because I'm using a doorbell Pro and a doorbell 2 (which doesn't require as much power because of the battery), should I still use a 30VA adapter? Or should I use a 20VA instead? 2) Does each doorbell require a Pro Power Kit V2? 3) The Doorbell 2 requires a resistor. Does the Pro Power Kit V2 replace the resistor or do I need both? 4) Does the Ring plug-in adapter have a resistor built-in? I'm trying to compare the ring branded adapter and a generic 24v adapter. Thanks! Jake