Need help before I buy

I'm looking at getting 2 of the Ring doorbell pro's. I did have existing door bell wiring, but the old mechinal chime died along time ago.. ect.. anyway, I wanted to get the 2 pro door bells and wire to the existing wires, and then replace the old trasformer with the Ring one.... so 1st. I can hook both pro door bells to the transformer correct? 2nd. since the old chime box is gone... (I plan to get the RingChime pro plug in one anyway) am I good to just hook the 2 door bells to the transformer? I looked up the instructions for the transformer and it's says for the pro door bell and existing chime box. (pasted that below). *Note: This transformer is only for use with* *both a Ring Video Doorbell Pro and a 16-24* *volt AC doorbell chime. To power a Ring Pro* *on its own, try the Ring Plug-in Adapter.* Also, I did just find this... [Wiring Diagrams for Ring Video Doorbell Pro Setup – Ring Help](https://support.ring.com/hc/en-us/articles/360022454432-Wiring-Diagrams-for-Ring-Video-Doorbell-Pro-Setup) So I need 2 of these "power pro kits" haven't found them on the site yet...