GL1200 Opal x3 - 1 router , 2 extender

Routers
1

I have 3 of the 1200 Opal routers.
None of which will be Internet enabled. So turn WLAN to LAN. (got that)
1 Main will have 2 wired connections - PC and a controller (100m Ether connection)
Other 2 will have a singled wired connection each (same model controller.)
Want them Wifi to Main so I chose Extender selection within More>Network Mode.(got that)
How can I assign them a static IP?
Assume their DHCP is disabled when in this mode?
(as I dont see a way to turn of DHCP?)

The controllers have assignable static IP’s
But I dont know MAC address and am currently trying to figure that out. As I assumed I would assign those within their respective router.

Am I on the right track?

2

Any chance of a diagram of what you are trying to achieve, is this a local non internet WiFi configuration all local network?

3

Closed local network without Internet.
Router 1 - LAN 1 = computer , LAN 2 = Controller 1 (assignable static IP)
Router 2 - LAN 1 = controller 2 (assignable static IP) wireless to MAIN
Router 3 - LAN 1 = controller 3 (assignable static IP) wireless to MAIN
No WAN connections.

4

From Router 1, you can reserve the Repeater IP addresses.
DHCP is turned off in Repeater mode.
Controllers static ips would also be reserved in Router 1.