Your $search_engine is as good as our $search_engine, in general there is very little information about this device (but at least two major h/w revisions, which won't help gathering correct information, as v1 and v2 might be completely different hardware). The only information I can find (with a big grain of salt), would be https://www.purepc.pl/test-routera-mercusys-mr47be-korzystnie-wyceniony-i-calkiem-wydajny-router-z-obsluga-najwazniejszych-funkcji-wi-fi-7, which suggests ipq9554, 1.5 GHz, 1 GB RAM (might be tight, the competition comes with twice that).
…and if your intent was to run OpenWrt on it anytime soon, all of that was wasted. So far there is very little target (and zero device) support for ipq9574 in OpenWrt - and even under the best circumstances it will take months++ (fairly into the double digits) for the development to get anywhere usable (and that's before even talking about this specific device, additionally there's always secure boot threatening on the horizon).
You have it sitting on your desk, the task will be all yours:
Be very careful, all web formwares call themselves “CLOUD” which means they might be trustzone or worse locked down, preventing the device being ever usable. For documentation - can you get a boot log via web interface before POISON CLOUD upgrade?
DO NOT USE APP for initial setup, you may slip through with standalone firmware with wonderful bloats of telemetries (not cloud endpoint depending on internet connection to start up)
That is not so tragic, ULP processor will run cooler, and both support hardware offload in mainline kernel (vs older platforms needing proprietary NSS drivers)