i think they have an interface pcb between the pcie look a like connector
this connector does bring power to the lto
check if you can remove the top plate, to check what is the main connector(s) going to the rear of the lto tape IE scsi, ide, sata etc ... supply ones
you'll know if they can be put internally IE a data connector and a supply connector
Some sas drive have dedicated interface boards, you can not add them internally without the right hardware / backplane / hot swap etc ...