There are a few requirements in getting Bluetooth working. But the main one that is the most important, is that the bluetooth dongle supports Linux, thats your starting point.
The next thing you gotta do, is make sure your Linux OS, has all necessary Bluetooth Libraries. Yes, Windows comes with all that stuff by default usually.
But many Linux OS's are trimmed down versions, which have missing libraries. Those must all be installed. The other thing, is its best to have Kernal version 4.9 or better.
And if your running on Zorin OS 15.3, which is based off of Ubuntu 18.04, you should be running kernal version 4.9 at the very least already! And the kernal can always be upgraded to a higher version as well.
Once the requirements are met, the dongles should work perfectly. The link that I provided to the dongle that supports Linux, descusses these things in the description of the product.