Routing with NAT and the kinds of SQM that people seem to (reasonably) demand at those rates would be hgh-end ARM or x86_64.
See, for example this thread
APs, your choice (dedicated AP, all-in-one configured as AP) with ARM preferred over MIPS at rates above 400-500 200 Mbps aggregate throughput on wireless.
The Archer C7 units are solid. I've used them for many years here as APs. In close proximity, with a MacBook Pro, I get 150-250 Mbps throughput on 5 GHz to a wired host. A quick check shows the CPU running well over 50% during these tests.