Video Doorbell 2nd Gen and Solar charge

Hi Community
I need help in installing my video doorbell 2nd gen with solar charger. Tried watching few YouTube video but couldn’t figure out.

What i understand is video doorbell 2nd gen is in two parts: doorbell itself and mounting plate.

And solar charger is a separate item.

Do I need to install doorbell WITHOUT mounting plate on solar charger or WITH it ?

In case it’s with the mounting plate, I couldn’t see adjacent holes for screws ? In case it’s without the mounting plate, same confusion.

Pls guide after looking at the pics and try to explain in simplified terminology or please share a video that includes this specific installation. Surprised to see Ring hasn’t had a single video explaining connecting doorbell to solar charger.

Thanks in advance