Are this compatible ? XWNB5201 and XAVB5421

Thanks. i managed to isntall them connecting them as you suggested and it works. But it only works if i dont "secure" the connection. 

I tried pushing the secure button on only two (and the third wont work) but if i push them all then the one that i push last wont work either... so either way my secure connection doesnt work, just the open one . Tried all the different ways (always pushing the secure button on the one connected to LAN and the two other on different orders, even connecting them side to side and pushing the secure button of #2 and #3 at the same time) 

I have: one XAVB5421 connected to the router, and the two XWNB5201 

But, anyhow, it works, it will remain open i guess.

Thanks so much for your help, waaaaay better than the answers from Netgear technical support (is like talking to the manual... nothing extra)