Billion 8800NL supports ADSL2+ and VDSL2 and also has an Ethernet WAN port so if you use a service with a different modem required you should still be able to use the Billion as a router.
Cannot say I've set a billion up using an ipad, but given configuration is browser based it should be fine.
One proviso to having just wireless devices and this applies to any router that providers wireless, having one device that can connect via Ethernet is always a good safety net in case you mess up when configuring wireless security.