I really doubt you actually need 5.1, unless theres some explicit reason for it. So you can save yourself few bucks and get tp-link 4.0 dongle.

Or if youre set on a higher version, than rather go for 5.2. At least 5.2 has some notable improvements(like good quality 2 way audio for using with bt headsets) that makes it worth it in case you get a device that supports it in the future.

Something like this. Or look for an alternative that has the same chipset, intel ax210.

With the 4.0 you wont need drivers, win10 will detect it and you will pair through windows.

Not sure if the ax210 is also plug and play as i havent used it(though it should be), even if it isnt youll just need to install drivers and pair through its app. Probably better option than using the built in win10 drivers even if it installs automagically.