Do we really need to enable NetFlow on all physical interfaces connected to servers or endpoint firewalls in case SVI (L3 interface ) has NetFlow configuration.

Do we really need to enable NetFlow on all physical interfaces connected to servers or endpoint firewalls in case SVI (L3 interface ) has NetFlow configuration.

We are not getting NetFlow traffic details properly details but configured on the SVI (Layer 3 interface)
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Do we really need to enable NetFlow on the all the physical interfaces if NetFlow is already configured on the SVI (Layer 3 interface), or is SVI-level NetFlow sufficient for our monitoring requirement?