Multi-region, US vs EU (different voltage, Z-Wave frequency)

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Smart-home gear is one of the most region-specific categories in ecommerce. Three axes:

Voltage, US is 120V, EU is 230V. Smart plugs, dimmers, hardwired switches are region-locked. Cameras and doorbells with USB-C power are universal.
Z-Wave frequency, US is 908.42 MHz, EU is 868.42 MHz, AU is 921.42 MHz, IN is 865.2 MHz. A US Z-Wave lock will not work on an EU hub and vice versa. Buyers do not always know this; returns are brutal.
Plug type, NEMA 5-15 (US), CEE 7/7 / Schuko (EU), BS 1363 (UK), Type I (AU). Smart plugs are physically incompatible across regions.

Magento mechanics: Multi-Source Inventory (MSI) with region-specific warehouses (us_warehouse, eu_warehouse, uk_warehouse, au_warehouse). Customer geo-routes to a stock via Cloudflare geo header → Magento store view. SKUs flagged as region-incompatible auto-hide in the wrong stock so a US shopper cannot accidentally add an EU Schuko smart plug to cart.

Pricing + currency: separate store views per region. US in USD with tax-exclusive prices; UK in GBP with VAT-included; EU in EUR with VAT-included. Same SKU pool, different price visibility, different checkout (Klarna in EU, Affirm in US, Clearpay in UK).

Skip this and you ship a wrong-frequency Z-Wave lock to an EU customer who returns it angry, refund + return-shipping eats $80 of margin per occurrence. At scale this is a $50k+/yr P&L line.