This depends on the currently used D-STAR network (and server software). Local module registration is only important on legacy REF/XRF servers. For example, XLX servers don't care about any registrations at all.
I think you don't need to use separate local module registrations, just register the D and the space module for your callsign and that's all. My registration for example is
http://regist.dstargateway.org/regcheck/index.php?user_cs=HA2NON