I have mesh deco system of Deco x20 (two devices).

I recently purchased Archer BE400.

1- Could someone please explain me on how to use this router in conjunction with my Deco x20 ?

2- How do I interconnect these devices i,e, my wifi 7 router and my wifi 6 mesh router so they work efficiently and also increase my network range ?

Please help me with the best possible configuration.

thanks