In a virtual box, so you know when you install it for real on your hardware the procedure will even be a bit easier.
Did you listen? You don’t need to install right away, your 20.3 release will be supported up to 2025. But you may install the BETA even now, since the Mint team works so flawlessly the beta is perfect and can be trusted. So do as you fukn fancy, it’s all good. Just enjoy the freedom!