Ok I’m gonna do this!
In terms of leaving uncovered - is the fridge the best place or will a nice cold garage do? Do you salt yours the day before? I’d worry that could draw out moisture
Uncovered in the fridge will dry out the surface better. A day of salting isn't going to draw out any noticeable amount of water from a big hunk of meat, except at the surface.
If you're going Rib of Beef I can thoroughly recommend cooking it the Serious Eats way...
It's fail proof and definitely the way to go, we had a lovely joint a few days ago cooked this way.