I had fibre installed yesterday. I have used the Spark supplied  router as the master router that feeds a power line over internet to a Linksys 1900 AC in the lounge. Have I done the right thing by using a static IP for the Linksys router and gateway being the spark routers IP?  I am aware of DHCP conflicts and have made sure DHCP assignment is only turned on with the master router.

The goal was to just have the Linksys router in the lounge as an extension of the Spark router.

Any feedback is much appreciated. I can take pics if needed of configurations.