some questions about SRIOV function

Dear friends

Hi

i have some question about SRIOV :

1- Is vCenter mandatory for use this feature or we can use it with single ESXi

2- how many vms maximum can use from one PNIC in sriov mode for esxi 6.7?

3- Will all of vmware feature such as vmotion . drs , FT , HA , ... disable in sriov mode ?

4- the most reason for use this is just for diminish

5- can a few machine use pnic in virtual mode and others use this pnic in SRIOV mode?

BR

Babak