So, in that set-up, SQM will nicely work to debloat your internet access, and that will also affect the wifi clients, AS long as your wifi rates are considerably higher than your WAN rate. Otherwise you might encounter wifi-bloat and that is not something that SQM on the router can fix. That said, even on the a9 SQM could not do much for you, to solve that issue, the AQM needs move into the wifi stack, like in the case of Linux's ath9k, ath1K and I believe mt76 wifi drivers. I have no idea what tp-link uses on their own OS version.
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