This isn't meant to sound condescending but I'd suggest that you consider what WiFi speeds you need, as opposed to what you want. By that I mean what speeds are you currently getting, what is that preventing you doing & what speeds do you need to correct that? It's all too easy to fall into a trap of faster (more expensive) must be better. But realistically, unless you are routinely moving huge files around your network or downloading similar huge files to these devices from the Internet, you may not actually need WiFi 6.
** I'm no longer active on the forums. **