... and then you just hang iPerf up in the air and come back to reality. It's not just the access point, but mainly the antenna configuration, and here the end device is usually the bottleneck.
Boy oh boy, what half-knowledge or ignorance is being thrown around here. Really crazy and especially brutally confusing for the OP, who obviously has no idea about network technology. For , the simplest possible Fritz solution is probably the best. Everything else won't work without external help. And with enough LAN ports near power outlets, you can easily upgrade the devices as needed. It might not look good, but it works.