DNS Forwarding towards multiple DNS servers

We are testing a scenario of forwarding DNS lookups towards different DNS servers. Below setup is what I plan to configure but I am not sure if it will work. I'm quite new to GTM and not sure if my understanding on the name configurations setup is correct.

recursion yes; 
allow-recursion {
    10.0.0.0/8; ==> For this network forward lookup to below servers
 };
forwarders {
    8.8.8.8;    ==> Forwarder for resolutions not covered by 10.x.x.x
    10.1.1.1    ==> Forwarder for resolutions covered by 10.x.x.x only
};
allow-recursion {
    192.168.0.0/16; ==> For this network forward lookup to below servers
 };
forwarders {
    192.168.1.1 ==> Forwarder for resolutions covered by 192.168.x.x
};