In the forums [0](Discourse alert) you have many threads with suggestions, too!
[0] https://forum.openwrt.org/c/hardware-questions-and-recommend...
https://www.linksys.com/nz/wireless-routers/wrt-wireless-rou...
The WRT1200AC family for example does not support WPA3, because the closed source Wifi firmware does not support it. The 15 years old WRT54G supports WPA3, it is just very slow. ;-)
Currently I would suggest the Linksys E8450 / Belkin RT3200 (same hardware) or some other device using the current Mediatek platform with MT7622 + MT7915 + MT7531. (2 X Cortex-A53, Wifi 6) All chips are supported in recent upstream Linux kernel, including Wifi. The Mediatek router team is currently doing pretty good upstream open source work for their chips.
I'm still happy with OpenWRT on my WNDR3800 for now either way.
I own an Omnia and despite it having been a bit rough a few years ago, it's now nearly flawless. The MOX is modular and could be more interesting for your use-case but it can also get pretty expensive.
But uBlock origin and PiHole both do CNAME inspection to block this.
Is there other ways that ads are circumventing DNS ad-blockers such as PiHole?
Full disclosure, I have never built the firmware but I take great comfort that it is developed in an open source manner, and that I could build it if I wanted to.
If you want a dedicated OpenWRT device Mikrotik would be my suggestion.
DSL standalone termination is still widely available, as are standalone DOCSIS cable modems.