Gotta luv watching 2 super mods discussing the virtues of their choices of routers.
I'm kinda surprised he didn't at least try running a DD or Open-wrt on it, if its available before spending 3 bills on an Asus.
In the old days, someone would comment 'time to hand in your geek card'
I know, I know, we're all 20-30 years older now, and none of us have the luxury of screwing around like the old days.
That said, Michael Horowitz has a great blog on
https://routersecurity.org/rsoSiteIndex.php
If you're a geek, and own your own home, the best thing you could do would be to get a couple of Ariba 215's off eBay for $20 which will work in autonomous mode, and simply pull their cable back to your router. If you're router doesn't have PoE, then get a cheap PoE switch, or PoE injectors.
Now you have redundancy for wifi, and if the router ever dies you can replace it and know your wifi is going to be as good as your site survey was originally.
Don't even need to term cable, just measure run and buy with some extra slack length.
Only pain is getting in the attic or the crawlspace. An hour or two of sweat.