QoS - Traffic Priortization, QoS on Vlans, DSCP QoS,QoS in Nv2 network

Traffic Priortization, RouterOS QoS Implemetation
https://wiki.mikrotik.com/wiki/Traffic_Priortization,_RouterOS_QoS_Implemetation

QoS in Nv2 network
https://wiki.mikrotik.com/wiki/Manual:Nv2#QoS_in_Nv2_network

DSCP based QoS with HTB
https://wiki.mikrotik.com/wiki/DSCP_based_QoS_with_HTB

QoS on Vlans
https://wiki.mikrotik.com/wiki/Vlans_on_Mikrotik_environment

Could I ask , on network
CPE – L2 Bridged (PPPoE VLAN) + QoS on Vlans +NV2 “N” frame priority + DSCP based QoS

AP - L2 Bridged Vlans + QoS on Vlans +NV2 “N” frame priority + DSCP based QoS

PtP - L2 bridged Vlans + QoS on Vlans +NV2 “N” frame priority + DSCP based QoS

I am confused how QoS will work in this scenario, any advice or suggestions is most welcome?