In general we need only one virtual router for any firewall functionality. If there is need to have multiple routers on a single firewall hardware based on the needs then we can enable them to use as needed.
Below is a doc talking about multi virtual system where they discuss about multi virtual routers if needed to have the single hardware split to multi system and multi routers.
The number of virtual routers you need is dictated primarily by your routing separation needs.
Yes, a common case of two virtual routes is having two ISPs. This way each router has one default route and each ISP has a source of traffic in that router.
Other use cases for multiple virtual routers is multi-tenancy. If the datacenter has a need to have routing separation from multiple clients, then virtual routers provide a simple way to achieve this. These are especially useful when running OSPF to keep the routers from one client from leaking into the routing tables of another unrelated client.
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