Ok so you definitely have PPPoE Ethernet Fibre, not VDSL.
So given your extremely high WAN speed and wish to have that available wirelessly I can only really recommend the RT-AX88U as your main router.
Obviously we’re only going to recommend Asus here!
You should also install Merlin firmware on it for best stability/security/feature set. If you really want to get into tinkering you can install amtm (it’s baked in so easy to do) - but that’s definitely an advanced option!
If you can run an Ethernet cable from the ONT on the wall to somewhere fairly central in the home then that alone might do the job. It depends on where in the home your REALLY want/need 900Mbps coverage for a single device.
Side note - 900Mbps service offerings are not really designed to allow 1 device to use it all at once, it’s so multiple devices can all use several hundred simultaneously... this is borne out by this whole discussion and the difficulty in achieving single device 900Mbps throughout without buying bleeding edge new technology!
If you can’t locate the router optimally and/or find you have a ‘slow spot’ where you want/need a fast spot, then you could add an RT-AX58U as an AiMesh node. I absolutely strongly and categorically recommend this be connected to the 88U via Ethernet, not wirelessly, due to your throughput demands.
The RT-AX3000 is another name for the RT-AX58U so is an option for an additional node.
Avoid the RT-AX56U as it does not support 160Mhz channels and is 2x2 only so won’t offer as much throughput.
I would consider this a pretty future proof setup with the 88U offering 4x4 160Mhz AX Wi-fi.
Your biggest bottleneck will be the majority of your clients not supporting the AX standard (yet). And even those that do will probably only be 2x2 and possibly only 80Mhz capable, so limiting them to ~1Gbps connection rate (~600Mbps throughput). It’s going to be another couple of years before 3x3/160Mhz AX clients become the new standard and so offering 2-3Gbps throughput.
If you want to understand more, find a couple of hours to read this
https://www.duckware.com/tech/wifi-in-the-us.html
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