CEPH cluster configuration

We've a higher than usual speed device (2GB/s) which we intend to use as OSD. We are not being able to get with ceph tell osd.x perf the expected performance. We want to run BLUESTORE and it seems to get the performance we need we'll need about 4 OSDs per storage device. We'll need someone to create 4 OSDs in the same device (without using LVM) and to have each OSD with it's own WAL device and DB device and do all required changes/debug so we can take the needed speed from the high speed device (at this moment limited to ~300-500MB/s).