I'm a big fan of having energy monitors like this. I installed one (different brand) on a subpanel recently to monitor usage in my garage/shop, but honestly now I'm thinking about doing everything with them (can't just do one at only at the main panel, no one makes a reasonable 400amp mains setup i've found).

I went with an Emporia Vue. each one can do 16 circuit monitors, you can nest multiple together in their app/platform, and if you want to abandon hosted stuff there's an open source community out there that supports their hardware for now. The price is also better than most of the others I cross-shopped.