Prioritize SLA transparency, inventory visibility (WMS/API integrations), inbound/outbound throughput rates, racked vs bulk storage options, and demonstrated peak-season staffing plans. Also assess carrier integration, packing capabilities, and reverse-logistics handling to match your fulfillment mix.

Location relative to ports, major highways and primary delivery corridors determines truck miles and accessorial charges. Choose sites with direct highway access and proximity to carrier hubs to reduce linehaul expense and shorten last‑mile ETAs, improving customer promise accuracy.

Essential capabilities include a modern WMS with real‑time inventory API, EDI or API connections to major carriers, order orchestration for omnichannel splits, and reporting for SLA metrics. Look for configurable business rules, vendor‑managed inventory support, and secure EDI onboarding processes.

Model fixed vs variable storage charges, pick/pack labor rates, receiving and putaway fees, order handling minimums, monthly inventory minimums, and outbound freight pass‑throughs. Include one‑time onboarding costs, returns processing fees, and seasonal labor surcharges to compare total landed cost accurately.