A:AnswerShould work fine if Fortnite allows controllers. As for drivers, it works as is, but Logitech does have some nifty software from their site that has some nice features.
A:AnswerYes. Although you'll need to use DirectInput for it (which can be enabled by a toggle located behind the controller). For Xinput, you can use https://github.com/x360ce/x360ce.
A:AnswerThis controller is designed for PC, windows OS, I've used it no problem on Win 7 or Win 10, Best bet would be to email Logitech support and see what they say. They do make game pads compatible with Macs and Ipads, you can browse apple site for them. You may get better mileage and no configuration headaches with Apple rated ones.