I would have the same SSID throughout, use mesh routers such as the successor to the Deco M9+, and be prepared to use a Powerlink-type connection as the backhaul between devices. However, with beam-forming and 802.11ax, you might just be able get a wireless backhaul connection at that distance. With the added bonus, you get Bluetooth and Zigbee support everywhere. We use a mix of Deco kit and, together with the management tools, have been very happy.