Double link networks

I have 2 radio links from my ground station to the uav. One link is an ip based ipmesh on a 192.168.0.x network, second link is on a 10.8.0.x Openvpn network.
What is the correct method to use both in a failover configurtion?
Can i just udp out to the 2 different ground ip or should i add a link in the configuration after mavproxy starts.
I guess my question is, adding a link with link module is the same as starting mavproxy with 2 different udp out or not?
Taking a second look i think link module only manages master links, am i wrong?
Should i connect 2 serials on apm and make 2 links from the 2 apm serial connections to the 2 different ip on my mp ground station?