How to access multiple netgear routers using internal reverse proxy

I have 3 netgear routers on my home network, all set up in AP mode on separate subnets.  Accessing them via www.routerlogin.net doesn't work for me because a) all 3 try to use the same www.routerlogin.net URL and b) they're unencrypted and/or using untrusted certificates. 

I have an internal nginx reverse proxy I use for other devices that properly resolves using my internal DNS servers and maintains valid certificates.  I've been able to set up the Orbi RBR50 and Nighthawk R6260 in nginx and it works fine, but my Nighthawk AX4  insists on redirecting to www.routerlogin.net (which redirects to the RBR50), www.netgear.com (unhelpful), or simply doesn't resolve.  This occurs regardless of whether I'm connected via LAN, to the AX4 WiFi, to the RBR50, or to the R6260. 

1. Is there a way to change the hostname of the router to something other than www.routerlogin.net?

2. Is there some sort of proxy configuration/headers I need to provide in nginx to get this to work? 

3. Is there a way for me to disable the redirection (i.e. update and/or remove the device's internal DNS which is overriding the DNS settings I have defined for it)?  

Any help would be greatly appreciated.