RT-AX3000

A single router covering 2000ft is not realistic. What I would do is purchase the RT-BE55 as your main router due to the much faster CPU and an RT-AX3000S to use as a wired access point. A Ubiquiti system would offer centralized management and more performance but that would push the budget considerably higher.

The RT-AX58U (first one) is the best out of the 3.

We just signed up to the same plan and this is what we went with. https://www.officeworks.com.au/shop/officeworks/p/asus-ax3000-2nd-gen-dual-band-gigabit-router-black-rt-ax58uv2-asax58u

Ok, you don’t need anything to flash then. I got this one: https://www.asus.com/nz/networking-iot-servers/wifi-routers/asus-wifi-routers/rt-ax3000/ Mesh capable if you need it (you shouldn’t with 100m2) wifi 6 which is fast enough for the type of use you’re describing. Has a bunch of the handy ASUS inbuilt features . You will probably get 5- 7 years out of a modern router before they stop doing firmware upgrades etc so consider that when you buy.  . Wifi 7 is only worthwhile in super busy areas and if you have devices with it otherwise wifi 6 or even wifi 5 is fine, Mesh is only needed if you need to extend coverage etc. most people massively over buy when they get a router. Your limited to what your fibre plan allows you to download so if your plan only lets you do 500mbps no point having a 10,000mbps router. 3000mpbs is more than enough for 99% of users 

This. I have the RT-AX58U. It's OK, but I'm moving to a Flint 2 soon. I miss OpenWrt.

I own the ASUS RT-AX1800 and RT-AX3000. I like them both. I don't use either of them as my gateway anymore though. I upgraded to a sg-1100 pfSense gateway recently and have both the routers running in AP mode now. One for upstairs coverage and one for downstairs coverage. I, as others have said, encourage you to install Merlin firmware if you choose ASUS. Just make sure your model has Merlin firmware available. The RT-AX3000 v2 was my gateway before the sg-1100 and I had to install forked third-party Merlin firmware because there weren't any current versions that supported the v2 model.

Get this instead... https://ebay.us/m/86Zycg I always go for Asus because all of their services come with purchase.