Focus on measurable KPIs and operational fit: on-time-in-full (OTIF), inventory accuracy, average order cycle time, and slotting efficiency. Assess carrier lane density, SLA penalties, peak-season scalability, tech integration (WMS/API), and value-added services like kitting and returns handling to align cost-to-serve with service expectations.

Carrier access and lane density determine consolidation and dispatch frequency. Close proximity to ports and trunk highways shortens drayage and enables more reliable intermodal schedules, while a dense regional carrier network supports daily cutoffs and improved last-mile windows—reducing lead-time variability for cross-border and domestic shipments.

Prioritize flexible storage (bulk and pick modules), zone and batch picking, fast sortation for small parcels, temperature control where required, and robust returns processing. Integration with OMS and carrier APIs, plus kitting and light assembly, allow 3PLs to service mixed B2B and DTC order profiles efficiently.

Define KPIs such as OTIF, pick accuracy, dock-to-stock time, and returns turnaround. Onboarding milestones should include WMS/API integration tests, phased inventory migration, pilot order runs, SOP alignment, and staff training. Agreeing acceptance criteria and rollback triggers reduces go-live risk and ensures operational continuity.