How should I position external access points for best roaming and coverage?

Place external access points where the users actually work, aiming to cover common areas with minimal walls and metal obstructions. Use wired backhaul whenever possible to keep roaming smooth and speeds predictable; if you can’t run cables, plan for robust wireless links and avoid stressing long, indirect paths. For larger deployments, ensure the router can manage the network with appropriate VLANs and consider a central management approach; a separate managed switch and controller can simplify administration and future growth. If you can, share a floor plan and your planned AP count so we can suggest a practical topology.