So can I replace my swisscom box with the asus box or how do I see it?
Or can I also connect the 2 boxes to have one at the bottom and one at the top? If so, how useful is that?
There is an access point mode but then you better buy an access point from unifi than the asus router. Or you can make a subnet. But then you have double nat (x.x.1.1 and x.x.2.1 below)