one of the model I am looking out is Ubquiti 6E access point.
Thank you @lilsense.I see Eero Pro 6E and it covers 2000 sqft with one AP, to cover 6000 it requires set of 3 AP as per their website. They are offering monthly plan for premium features which I assume is not required and I can leverage what is offered in Opnsense
Otherwise go with OpenWRT and/or DDWRT, but it will be a much more involved experience finding the right router, flashing, configuring and upgrading it.