GTM config when F5 is behind firewall

Hi,

I have two sites behind the firewall,and same F5 is used for GTM as well as LTM, behind firewall GTM config is done as per below solution.

https://support.f5.com/csp/article/K14707

But local site GTM and LTM will be communicate on private interface but remote site it will be on public interface.

so when config is done both communication IP can not be given,

GTM can communicate on private or public.

so please help if anyone has done this type configuration.

Thanks in advance.