Synology two servers - port conflict bubbleupnp

[rayge]

Is it possible to set up two synology servers for external IP access on same network and router?
The port range is 58050-58051 in Bubbleupnp server setup and seems to be locked to those ports.
My Netgear R7000 router sees both servers, but returns the error "port conflict with other service" when I port forward the 2'nd synology NAS to the same port range.