External SSD for Games

I posted on here a while ago about moving from a desktop to a laptop (still having trouble finding a laptop). Because 4 TB SSDs are too expensive I'll likely be using a 2 TB SSD and splitting it between Windows & Linux. To save space I'm thinking I'd like to install a game and or my Steam Library on an external SSD, would this work if both the SSD's and the computer's usb ports were usb 3? Thanks.

I'd also be splitting this external SSD, probably half ext4 and half NTFS.