Citrix and APM Dynamic Webtop NAT Options

If you apply a SNAT configuration to the virtual server (which for most configurations you will do) then yes, the APM to XML broker would also use the SNAT configuration. In general unless a particular "back end" server is using the BigIP as its default gateway you will have to use SNAT (either a SNAT pool or automap) to avoid asymmetric routing issues. The only reason to have concern about this is if for some reason the real client IP is required by your application. With Citrix this is not required when APM is providing ica proxy services. SNAT pool or SNAT automap is the usual configuration in this situation.