I need to revise my first reply. According to the page at DSLR I linked to, the modem handles the PPPoE login itself. If this is the case for the modem you receive, then the router would not need to support PPPoE. I would imagine it would only need to support gathering an IP address via DHCP, which again is something common among today's routers, whether one port, three port, wired, wireless...
Aaron