I’ve looked at the Flint 2 but it’s too large and can’t stand vertically (unlike the hAP AX3 which runs RouterOS), according to the manufacturer stated dimensions it should fit but it would be too close to the ISP box.
Ended up getting a Mikrotik hAP AX3 from a local retailer as the ISP's ONT WiFi was cutting and making me impossible to WFH.
The performance of this device is amazing (quad core 1.8GHz Cortex A53 and 2.5GBe WAN), I pay for 500mbps and now I'm getting 670mbps over WiFi. Wish it could run OpenWrt in the future but in the meanwhile RouterOS 7 is very good.
The IPQ 6xxx linux kernel support I saw someone started to port in 2021 and still nothing solid nowadays, so I guess the chance of getting support is a bit low....
If you really need something that can stand, if you can still find the Netgear WAX206 it would be the best and I'm sure it won't lose to your AX3 however WAX206 has solid OpenWrt support (I own it), and with OpenWrt my WAX206 can choose to run 80MHz channel with 4T4R or 160MHz channel with 2T2R (this option is not even available in stock firmware).
RouterOS is indeed a good piece of software (I used it a decade ago), what I don't like is their WiFi support, now the WiFi 6E/7 already there and Mikrotik is still doing 80MHz channel only WiFi 6 which I think sucks.
For my needs the built-in radios in the AX3 are excellent, this a quick speed test I did over WiFi from my MacBook to a wired server on my LAN. If you need to deliver more bandwidth I'd probably look at a top of line AP like the Unifi U7 Pro Max (or similar hardware supported by OpenWrt).
Also the WireGuard server performance is way better than any MT7622 device out there, just look at this 700mbps throughput connected to the VPN from the MacBook through the IoT WiFi network which is in a separated VLAN to the wired server in my main VLAN.
SOC support is basically there, the only real stumbling block for ipq60xx lies in QCA's court (and that's not good news), in the sense of them having to (formally) release wireless firmwares that don't crash and burn with the old BDF provided by the various router vendors. In terms of performance, it's plagued by the same issues like ipq807x (and ipq806x beforehand), with a lot of untapped potential in their basic switchdev drivers.