Regarding the positioning, take a look at the pictures at https://www.samsung.com/ch... – slight angle so that the speakers are facing the TV, solid side of the speaker facing the middle (might be a bit counterintuitive).

For the stand I went with Mounting Dream MD5402-03 (same as Amazon Eono) – they look pretty good and have a dedicated screw for the Samsung speakers. They are a bit bulky but the overall setup looks good.

I still have Hama speaker stands from an old 5.1.2 system.