
With my a7r3, I also like using Spot Metering tied to Focus Point Link so that wherever my Flexible Spot focus point is, it will meter for proper exposure at that point. I think this is very useful for portraits or images of single objects.
Note too how multi metering works when Face Priority is also selected.
From the 'Help Guide'
This is totally how I have my rig set up. It's very, very handy! It eliminates the need for exposure lock/recompose like I used to do with canon cameras.