The Studio and the Mini have the same exterior width/depth dimensions 7.7” x 7.7” so in theory anything designed to sit below/above a Mini should also look good with a Studio.
But this Satechi dock has a depression on top that the Mini’s circular base would nest into, I don’t know if the Studio has the same size circular base, I think they might be a bit different. A Mini-sized hub/dock with a flat top would be the most certain to be compatible with the Studio.
Do you have the Satechi USB-C dock already? I’d be curious to hear how it fits together with the Studio.
OWC has a MiniStack line of accessories you might like. The MiniStack STX has an NVMe slot, 3.5” HDD bay, and a Thunderbolt 4 hub in back, except it’s black for some reason. The regular MiniStack is a 3.5” HDD bay only with a USB 3.0 connection. Both have flat tops so should fit well under the Studio. For NVMe a Thunderbolt connection would be preferable to a USB-C connection for speed.
I’d wager we’ll see an updated MiniStack STX within the year that’s a better aesthetic match for the Studio.