Prioritize carrier connectivity to Spain and France, customs and bonded warehousing capabilities, returns processing, SLA guarantees for pick/pack, and the 3PL's experience with peak‑season scaling and value‑added services like kitting and QA.

Because operations in the region frequently involve cross‑border movement and non‑EU tax regimes, select 3PLs with proven customs brokerage, bonded storage, and processes for duty optimization to reduce clearance delays and avoid unexpected costs.

Look for warehouse management systems with real‑time inventory visibility, integration with major carriers and marketplaces, flexible slotting for high‑velocity SKUs, multi‑temperature zones, and capabilities for returns and reverse logistics.

Compare landed cost projections that include transit, duties, and last‑mile fees; assess SLA metrics (lead times, accuracy); evaluate labor availability and peak surge capacity; and run scenario models for order profiles to quantify tradeoffs.