Prioritize carrier proximity, average transit times to primary customer zones, dock door counts, peak throughput capacity, pick accuracy, and SLA reporting. Also evaluate WMS integration, weekend/peak labor availability, scale-up fees, and KPIs for returns handling to ensure predictable last‑mile performance.

Look for real-time inventory visibility, batch and wave picking options, SKU-level slotting, kitting and returns processing, seamless API integrations with storefronts and marketplaces, and multi-channel order routing logic to maintain accuracy and speed across channels.

Perform a total cost model that includes inbound freight, storage per pallet or cubic foot, labor per pick, outbound delivery zones, returns expense, and service penalties. Run scenario analyses for carrier mixes and volumes, and pilot operations to validate assumptions before committing to long‑term contracts.