fwiw, be wary of using ipq40xx device for SQM.
I have EA6350v3 (ipq4018) which I used for about 2 months earlier this year.
Testing OpenWrt 19.07 and 21.02, there seems to be a problem with SQM implementation. When I cap the ingress speed to 49 mbps, the speedtest results are not consistent when compared to other OpenWrt routers using Lantiq or MT7621 SoC.
Here is link to a PDF I quickly put together:
https://www.dropbox.com/s/2y1l3k2l1nfibk6/EA6350%20speedtest%20results.pdf?dl=0
If I use NoTengoBattery's build v2.1, the above issue with SQM is fixed.
https://forum.openwrt.org/t/optimized-build-for-ipq40xx-devices/44125/