Ceph » bluestore

Hi everyone,
I am using ceph 18.2.2 to create a cluster with NVMe device under SPDK driver.
When the device is connect to the host, there is a PCIe number, such as 0000:3c:00.0, then I can start the cluster by the below command

vstart.sh --new -X --localhost --bluestore-spdk "trtype:PCIe traddr:0000:3c:00.0" --bluestore

The above is OK. But
If Ceph is using the SPDK engine, does it have to have a local PCIe device?
If the PCIe device is connected to host through NVMe-oF, can we still use bluestore-spdk to start the cluster with NVMe-oF device?
If it is the malloc bdev created by SPDK, can we still use bluestore-spdk to start the cluster with malloc bdev?

Thank you.