AP or Router when connected to another router in a large space ?

Hello
I bought a new RG-EW 3200  pro to “boost” my 2.4 GHZ network in range for my IOT device replacing my old netgear Nighhawk 1900.
The signal strenght of the new router is much better and I am happy so far. Now I just wondering if I should use the RG-EW 3200  pro as second router vs the router in my fiber box (wifi 5) with different Network names on on different channels or if I should set the RG-EW 3200  pro to AP mode.
I have a big room to cover so the fiber router is at one corner and the RG-EW 3200  pro in the other corner giving me a nice coverage area …

I would like to know what functions I will use in AP mode (connected via ethernet cable to the fiber router ):

• any impact to signal strength with is set high today
• any impact on channel selection for 2.4 or 5G
• any impact on the dedicated smart IOT network the router creates
• any impact on DNS and connected devices  ( I think I should only run the DNS in the fiber box and not in the RG-EW 3200  pro even when in router ) ?
  

I understand that in AP mode the networks will have the same “name” as set in the fiber box router …
Is there any other “impact” or performance related point if I run the RG-EW 3200  pro in AP mode
Thanks a lot for all suggestions and any “how to” to considere .
it looks like that the RG-EW 3200  pro is always reset and forget all setting when set to AP or reset to router … so I would like to reduce trying it at it always disconnects all IOT device with a need to manually add them back on

Bjoern

Dear sir

Router Mode: EW works in router mode, which can configure NAT and DHCP server, it works as the primary router and allocates IP addresses to users to access the Internet.
Access Point Mode: Previously it was called wired repeater. It works as the secondary router which connects to the primary router with wire to expand the network of the primary router. The device and the user are in the same network which both get the IP from the primary router.
When you change the router working mode, the config will be reset coz the settings are different between different modes. When the router is in AP mode, you can not configure its LAN port setting, coz it works as repeater and all ports are in the same network segment.
any impact to signal strength with is set high today--->
The coverage is same in router mode and in ap mode.

any impact on channel selection for 2.4 or 5G--->
The router in ap mode can still support modifying the 2.4g/5g channel.

any impact on the dedicated smart IOT network the router creates--->

The IOT device can be reconnected after the router changes the work mode and rebroadcast the wifi.
any impact on DNS and connected devices--->

The user device DNS server will be delivered from the dhcp server.


Best regards
Jenny