Tags advertise; gateways listen. Each gateway reports which tags it heard and at what signal strength, and the platform infers position from the pattern across gateways.
Which means gateway placement is the system design. Too few and coverage has holes that look like assets disappearing. Poorly placed and zones overlap in ways that make the inferred position ambiguous. Placed without regard to the racking, machinery and walls actually present, and the propagation model bears no relation to the site.
This is why a site survey precedes a deployment rather than following it. Measuring propagation on the real floor with real obstructions takes a day and prevents a rollout that never quite works.