R7800 has no problem shaping 250Mbps with cake and you have the choice to use @ACwifidude or my build with fq_codel NSS HW acceleration, or you can build your own from our repo.
R7800 with NSS can shape 900Mbps with 3% cpu load on nss_fq_codel. R7800 also has damn good wifi. At 700Mbps 5G wifi load is only around 50%.
For me it is one of the best all around units. From the reports regarding sqm RT3200 might be good unit if only routing is important, but my experience with wifi on the MT devices isn't good.
The R7800 is pretty much the only router that can handle my wifi requirements. And I have about 30 different routers to choose from, MT, BRCM, QCA:-)