EDIT - Yikes, I just re-read your original post and I totally missed the word RENTAL. forget the wiring, you need lots of WAPs...enough for coverage. Ive heard Eero works well if you don't need to customize features. ZenWifi has its supporters as well. I wouldn't worry about wifi6 stuff until you get more permanently located, so that you can take advantage of wired backhaul...unless your landlord might be convinced to add future rental marketing value to his property by installing a wifi setup for the ages ;-)
First off, "gaming router" is a marketing ploy. Don't fall for it. You need a solid router, period, that can transparently make your 1Gbps connection smooth to all devices connected to it.
Your gamer girl is right on the money about an ethernet connection - anything that doesn't move, or rarely moves, probably like your brand spankin' new macs with wifi6, should IMHO be wired, period. That means desktop computers, smart TVs/streaming boxes, NAS...wire 'em up and turn their wireless off if possible.
wires arent as conveinient as "internet from the air/anywhere" but if you need a solid connection, you can not beat copper. (see also Tesla, Nicola - Wireless Power) further, you pay for wires/switches ONCE as opposed to continually upgrading Wireless APs for "faster/better/more reliable" wireless. 1000' feet of Cat 6 is a hundred bucks(?). can't beat it for security or privacy either.
If you're looking at the Asus stuff seriously (and you should), the AX86 is the current flagship (IMO- and it's wonderfully capable, now and for some time to come - the AXE stuff is starting to populate the market but I'm not sure what client devices support it)... but for coverage, you can match it with other of their more affordable AX and AC offerings to achieve "mesh" (if that's important - but it sounds to me like you'd be better off with APs that offer wireless based on what the clients connecting to them can support)
Wired ethernet backhaul is for the system of APs to appear cohesive ("in a mesh") - get that infrastructure communication/data off the airwaves to keep the path for your (critical) data...
and unless you really need to differentiate between 2 5Ghz bands, I wouldnt bother with tri-band stuff.
Hope this helps