Proxmox HA, Docker Swarm, Kubrenetes, or what?

I’ve gotten to the point where I have more than a few servers in my homelab and am looking for a way to increase reliability in case of an update. Two problems: 2 of the servers will be on Wifi and one is a Synology NAS. I can’t do any wiring but I can put together a WiFi 6E network for the servers only, That means buying 4...