Ring Doorbell Elite Install

Hello: My current doorbell (a doorbell video intercom) is connected from a phone in the house to the outside doorbell using a cat 5 wire. This cat 5 wiring isn't hooked up to a router but just runs from the phone to the doorbell so there is NO ethernet access at either end. There is also a power supply at the phone as well. The phone is where the chime is heard. I would have to install another cat6 wire for the POE feature (Ethernet access) to work with the Ring Doorbell Elite but my question is: Can I use the existing phone as the chime with the Elite Doorbell using the existing cat5 wiring? (This isn't the typical two wires you would see at a normal doorbell - but the four pairs of wires used with cat5) Also, does the Ring Chime Pro work with the POE Ring Doorbell Elite? (or does it work with the WiFi doorbells only) Since the Chime Pro works with WiFi: Is there a delay when someone rings the bell outside to when the chime is heard inside? If so, approximately how many seconds? Also, given that I have a stone wall - I won't be able to cut open a section so I would to install it on a surface mount box like the following link. https://www.etsy.com/ca/listing/1071252708/ring-video-doorbell-elite-surface-mount?gpla=1&gao=1&&utm_source=google&utm_medium=cpc&utm_campaign=shopping_ca_en_ca_a-electronics_and_accessories-docking_and_stands-stands&utm_custom1=_k_Cj0KCQjw98ujBhCgARIsAD7QeAguHLe1zINGNhziOA_NmWqL2O-jhA0Ij9WElLiH5U4GNAgIQQB5tB4aAvH-EALw_wcB_k_&utm_content=go_318290925_19444507125_75295291845_aud-1186559235309:pla-106552226195_c__1071252708enca_503543943&utm_custom2=318290925&gclid=Cj0KCQjw98ujBhCgARIsAD7QeAguHLe1zINGNhziOA_NmWqL2O-jhA0Ij9WElLiH5U4GNAgIQQB5tB4aAvH-EALw_wcB does this make sense?