The following might help but I use no RFX devices so take it with a grain of salt.

1) I never ever have to reboot the house Router. I never ever have to restart a WAP. I occasionally have to reboot a Pronto, but I am pretty sure I have one nasty bug laying around just so that I can't say "bug free"

2) 4 Prontos, three in "Set A", one in "set B", Three WAP's. Two of the WAPS have the same SSID as the Prontos in Set A. One WAP (The Theater) has the same SSID as the Pronto in the theater. This constrains the Theater Pronto to use the the Theater WAP, while all other prontos "share" the other two WAP's

I do not know how this would affect an RFX situation, but if the RFX's are hard wired to the router and all on the same sub net, it should be fine. It nicely isolates the Prontos in my situation.