@vikrantl 

Hi, Deco XE75 does not support multi-wan connections if it is what you want to know.

the best idea would be a have a router that is capable of dual WAN connections and set up the shared line as the main connection and leased line as the backup.

Then connect Deco XE75 behind this dual WAN router.

I checked TP-link routers if you still want to stay on TP-Link, this link would help and It also lists the supported models:

https://www.tp-link.com/en/support/faq/2133/ 

Thanks.

  @Heidi_Alp 

I also wanted to know the use case for single node or single pack XE75. Can i later purchase another XE75 and pair both? Would each XE75 have a in wan link and can each XE75 be paired with another XE75?

For example Netgear orbi has one master where I can connect wan-in and i can't connect a wan-in to other secondary units of the orbi.

Thank you

-Vikrant

  @vikrantl 

Hi, in the 1,2, or 3-pack Deco XE75, each node is the same and could be configured as Wan-In.

Sometimes, if you bought a 2-pack Deco XE75 the first time, then you need more WiFi coverage and you can buy one more XE75 individually or any other Deco model. They are all compatible:https://www.tp-link.com/en/support/faq/2248/