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You can install it on all your devices. However, for each installation after the first, you don't use the product key, instead, you log into Office.com with the Microsoft account you redeemed Office 365 Home to, on the new device. Then click install Office.
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![Microsoft - 365 Personal (1 Person) (12-Month Subscription) - Activation Required - Windows, Mac OS, Apple iOS, Android [Digital]-Front_Standard](https://pisces.bbystatic.com/prescaled/500/500/image2/BestBuy_US/images/products/f55bc6d1-a018-476a-9201-7699fcbccd95.jpg;maxHeight=100;maxWidth=60)