The Mek Mini is one step up from the ZBox series in terms of performance, features, and upgradeability. Its ample ventilation grilles on five of its six sides should hopefully be enough to keep temperatures and noise in check.
https://www.notebookcheck.net/Zotac-launches-Mek-Mini-PC-with-removable-GeForce-RTX-2070-graphics.414835.0.html