If you don’t want to wait, Owncloud Infinite Scale is basically ready right now, and Opencloud is unlikely to be more than a rebranded fork in the beginning anyway. So should be good for testing the principle right now.

monitors

Don’t underestimate the power draw of multiple monitors.

But while you’re at it: simply turn off different devices on the same power strip and check what actually draws how much.

Authelia

Think about implementing this pretty early, if your plan is to use it for your own services ( which I’d assume).

You mean available up/download speeds? In which format did you store your data? Which data fields did you record?

As I have basically all devices connected to my Nextcloud instance, I simply use that. I don’t have any “time-critical” file transfers though.