Thanks for taking the time to post an update. In case it helps you or anyone else, I posted pictures of my Chime Controller installation (running with a Video Doorbell v2) over here:
It’s small and easily fits within the home’s built-in chime box.
One other thing I’d mention that has helped me with my doorbell: If you have a way to know that your wiring inside the chime box is correct, then being sure that the correct wires are currently attached to the FRONT and TRANS terminals might prevent some headaches later on. I’ve described elsewhere on the Forum how my doorbell stopped ding-dong!-ing after several months of reliable service, and while I was helping someone else troubleshoot an issue I decided to do some testing on my own end and found out that the transformer and doorbell button wires within the chime box had been connected to the wrong terminals before I ever started. Since I’ve remedied that, my doorbell experience has been much more consistent and reliable.