The answer is no because this is not a valid setup in real world.
With the design of our multi-WAN routers, there is no need to use BGP4 or other complex routing algorithms to support multiple ISP connections. The same range of IP address is not routable by two different ISP connections.
Therefore, the supported scenario is at most one of the WAN connections is using Drop-in Mode (or IP Forwarding), while all others are in NAT mode.