Your account does come with the option of 5 IPS. Personally I like the option of have a router behind the modem that does the PPpoE authentication and assigns an internal IP. I find that it is a more simple configurations and a router adds a level of protection to your computers from the Internet. Most routers will support PPPoE authentication so if you have one it will probably work. If not a cheap Linksys would work well.
If you want to use the 5 dynamic IPs you would just need a hub or switch to put behind the modem. You would then install the software that comes with the modem on all computers and have to login on each computer individually to get online.--
Will work for reviews.