The wvgate connects the DSM to the Core, so this would be the same for all DSM's.
TNG / TND is designed for precisely the configuration you want - multiple DSM's with 1 core, so there will be no problem.
You just need to tell each DSM which subnets or machines it should be monitoring - so that they are not all monitoring your entire network (which may result in duplicate messages).
You set this in the gwipflt.dat file, located in tnd\services\config\aws_wvgate
EG:
set DSM1 to monitor the 169.17.1.* subnet
set DSM2 to monitor the 169.17.2.* subnet
Then run clean_nsm on each DSM server.
Then after discovering the objects in your core, run setdsmname on each DSM.