If you're going to spend $300 on a home router and know what you're doing, I strongly recommend you don't buy this. Not because it's a bad product, but in that price category you should be separating the functions of router and wifi into their own discrete devices.

A ubnt edgerouter-x is good for up to about 800Mbps of NAT and runs an os derived from Debian and vyatta. Or something like a mikrotik rb4011.

Then buy a dedicated purpose wifi ap like a ubnt uap pro that does dual band 802.11ac.

A router should be a thing that has 1000baseT ports on it, maybe an sfp or sfp+ cage and no wireless. A wifi ap should be a thing with no routing functionality that serves the purpose to bridge a wifi client device at layer 2 onto some specific section of Ethernet fabric.