GTM integration in existing LTM infrastructure

Hi, I am configuring new GTMs one in each DC in active/active config. Currently, I have configured TCP and UDP listener IP in both GTMs. I have a couple of question, hopefully, someone can help me to clarify.

1- Can LTM iQuery and GTM Listener share the same subnet? or can they both be in the same VLAN? 2- Do I need to create a default route pointing to iQuery default Gateway, after I create an iQurey VAN in LTM? Currently, LTM is in one-arm deployment. VS and Nodes share the same subnet.

let me know if any further clarification is required.

Thanks