It truly is rare that someone may have so much bad luck, since QC is automated these days. Perhaps you may want to check your home's circuitry for noise or spikes, or install a power conditioner?
I'm not a lawyer doctor or electrician, full stop. Anecdotally, however, I've used ASUS for a couple of decades, and it's been above average in my experience.
I'd hazard to guess the router was something like https://www.amazon.com/ASUS-Rapture-Gaming-Router-GT-AXE1100... not your typical 2x2 wifi AP + gigabit router combo. I say this because I once returned such a top end ASUS model 3x (twice to swap, 3rd to refund) as they were all just some form of DoA. I felt like I was going crazy to the point I took the 3rd one to work to unbox it thinking. Based on the number of 1 star DoA reviews at the time vs the reviews now they seem to have figured it out.
Overall their support is a bit lacking for the high price point stuff if you turn out to need it, the low end or normal stuff I have no complaints on.
I'm not a lawyer doctor or electrician, full stop. Anecdotally, however, I've used ASUS for a couple of decades, and it's been above average in my experience.
p.s. $400 is like a lot of money for a router?