You're in the boat of deploying OpenWRT or similar low-cost APs presenting the same SSID on a shared VLAN, plugging them into your favorite PoE switch, and manu

You're in the boat of deploying OpenWRT or similar low-cost APs presenting the same SSID on a shared VLAN, plugging them into your favorite PoE switch, and manually configuring their channel strengths, etc. It isn't so bad if it's a one-and-done thing, but all of the out-of-the-box solutions are very IoT. Enterprise solutions with your self-contained WLAN controller and APs (not including PoE switches) are typically pretty pricey (>$5k, can spend a lot more).