Hi Eak,
This look fine to me but you need to make sure the following concern.
1. Backup the original COLOS setting from old PC on NN5, so you don’t need to build up the setting again which will take lots of time.
2. Study how to set up the CoLOS client on NN4 (Master in NN5). Attached is the procedure from Julien for your reference.
BR,
Sam,