I'm after something like this but without the RAID, so it has two SATA connectors
https://www.startech.com/uk/HDD/Adapters/dual-m2-ssd-sata-adapter~25S22M2NGFFR
There is a version which takes 4 x M.2 (with individual SATA ports) but it's a 3.5" sized unit
https://www.startech.com/uk/HDD/Brackets/4-M2-SATA-mounting-adapter~35S24M2NGFF
https://www.startech.com/uk/HDD/Adapters/dual-m2-ssd-sata-adapter~25S22M2NGFFR
There is a version which takes 4 x M.2 (with individual SATA ports) but it's a 3.5" sized unit
https://www.startech.com/uk/HDD/Brackets/4-M2-SATA-mounting-adapter~35S24M2NGFF