SSUPD Meshroom S is a 14.9L vertical sandwich layout SFF PC case with an all mesh external design similar to the popular Meshlicious. The case leans more towards liquid cooling with limited CPU air cooler clearance compared to standard reference layout cases of similar volume. You can also install ATX/MATX motherboards with some caveats… Still this makes the SSUPD Meshroom S one of the smallest ATX compatible cases available.
McPrue Apollo X
The Apollo X is a mid-tower CNC aluminium ATX case and clone of Apple’s 2019 Mac Pro. It supports large tower coolers, 360 radiators / AIO and most 40/50 series graphic cards. It’s priced at US$949 (shipping included) with limited availability.