Do I need to use the Power Kit?

So my issue is similar in that I have no existing doorbell or doorbell wiring and I do not have any space in my consumer unit. Need to understand whether I need to use the Power Kit and where I would install it if necessaryHere is what I have doneBought the Ring Doorbell Pro which comes with the transformerWired in a spare plug that I rated to 3A for plugging into mains socketCabled to the transformer using mains terminals 5 and 6Fitted the transformer into a junction box or single consumer unitRan a length of cable to the doorbell from terminals 1and 4Wired to the doorbell Powered everything up and it is all goodDoorbell showing over 4000mV on the App and it has been working fine ever since. Do I actually need to use the Power Kit given I have used the Ring Transformer and my power is ok