PPPoE every POP

If your network is routed, given a 4xSector (mpci) POP, do you create 4x PPPoE servers for each wireless interface or create just 1 by bridging the interfaces ?

or you run a centralized pppoe server ?

any comments ?

I just did bridge interfaces and setup a PPPoE Server.

i’d say one service per AP (might be 2 radios each AP)
all the services in one pppoe concentrator

@Medianet;

Can you clear it a bit ? One service per AP is distrubuted approach but how come one pppoe concentrator at the same time ?