Rax120 question

[danielshaw007]

Hi all. I don't live in a fibre area so using an ISP provided 4g router. Works well however I have an rax120 on way from amazon.
This ISP router has no options to turn off the DHCP.
I plan to turn off the WiFi on my isp router and use the RAX120 to handle the all the wireless traffic.
Question is, will devices use the netgear dhcp first if they connect to this rather than my isp router ?
If I plug my isp router into the WAN port in the netgear one will it work as I have described above?
Alrernative if I set the netgear to AP mode and just collect it to the LAN on isp router will it still have all the features available ?

I hope you understand my question.
Thanks

[plemans]

here's what features get disabled: 

https://kb.netgear.com/26765/Disabled-Features-on-the-Router-when-set-to-AP-Mode

Another option is to see if the ISP modem/router has a DMZ. If so, you can set it with the netgears IP address