WiFi Variable Best Practice?

Products Residential Wi-Fi
1

What is the expected practice for setting up WLANs and AP Groups when desiring to modify SSID and PSK?

I put in dummy SSID and PSK values in the WLAN configuration, and put these in the custom window:

SSID1=${SSID=WifiSSID} 
WPAPSK1=${PSK=123456789} 
RTDEV_SSID1=${SSID=WiFiSSID} 
RTDEV_WPAPSK1=${PSK=123456789}

Previously, in the WLAN I just set the SSID and PSK directly to variables, but support told me not to do that.

[I've managed to break many of our configurations. On the R195W, 2.4 GHz won't work, and on the R190V, 2.4 GHz won't work. I need to see what the intended configurations look like so we can stop further issues and start using the R195W.]

Thank you, Chris