A:AnswerYes, this monitor supports the Xbox one s and you should be able to play with this monitor. If you're facing any issues, we suggest you contact the Dell technical support team or the Geek Squad team and they will help you with this.
A:Answerthis monitor would not be worth using with an xbox as it is 240 HZ and you wont get anywhere near that. Not worth the money, I would go with a 140HZ monitor.
A:AnswerThe monitor has a VESA mount 100 mm x 100 mm and you can use that to mount the monitor.
Also, you can refer to this monitor outline drawing for measurements: https://dell.to/3eYPljA