Are you thinking of these things?
Amcrest is rebranded Dahua. EmpireTech sells Dahua cameras also.
Currently the maximum resolution Dahua makes is a 32MP in a four camera panoramic unit (four 8MP sensors).
This Amcrest unit appears to be four 2MP cameras - 4K.
These units with 4 cameras spliced into one panoramic channel is HUGE. The size of a soccer ball.
This is one I own (four 2MP cameras, released ~2017). Rebranded as IndigoVision - before Motorola Solutions bought out IndigoVision brand.
Buy the smaller 4k version with two 4MP sensors....
Cheaper and far smaller.