A:AnswerYes it is not a standard size though and you will need to get bolts that are a larger size than most and the spacing is also different. This would be a wall mounted stand, I do not know of any table top center stands.
A:AnswerConfirm the receiver is set to a Dolby ATMOS configuration. Also, make sure your device is set to output BITSTREAM and the content is mastered in Dolby ATMOS.