Yep, that's the way I have my network set up. I have a modem and three routers. One router is connected to the modem (in router mode) and the other two routers are hardwired to the main router and I have both of them in bridge mode, all three are dual band with the same SSID.
If you had coverage with a single dual band router before, just connect your Asus, and leave that wonky extender disconnected. You can't just connect that extender to the Asus without resetting it back to default, and letting it reconfigure itself to the other router anyway, because it will have configured itself for the modem/router and likely won't work with the Asus, until reset. Any time you make a hardware change, everything downstream of that change should be reset to default, and any time you make a software/programming change, everything downstream should at least be rebooted in sequence. Some changes don't require it, but some do, and it's simple to reboot.
Ok good then I do know some about home networking because I have set a couple up that way and everything worked fine. Yes I get and always reset everything back to factory whenever I make any changes to know I am starting the changes from scratch. The only thing I am alittle confused about is if I rehook the ASUS dual band router back up to the modem the ASUS router still broadcasts a 2.4GHz wifi network and a 5G wifi network. I have went into the settings and changed the 2.4GHz and the 5G SSID's the same but I still had the same problem. It was like the iPad was still connecting to the 2.4GHz band and not the stronger 5G band. Unless I am still missing something. The only thing I didn't do last time was going into the ISP's modem/router and disabling the modem part like you suggested earlier. Also I will have to hook the ASUS router up to the ISP's modem wirelessly because the modem is in the basement and the router is upstairs.
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