Yes, you can attach the Vesa adapter from the Samsung to the Oplite rails.
But I would recommend the 57", especially if you are coming from Tripplescreen. Unless you only play armoured personnel carrier simulator. 😉

I'm using the stand supplied with the screen, the mount is designated VESA 100mm x 100mm, so any stand designed for this type of mount and designed to support the weight of the screen should be suitable, like the Oplite MT49. The weight of the screen must be taken into account before choosing a compatible stand.

Mine came with an adapter for VESA 100 x 100, so I think this should be suitable for mounting

I use an ergotron hx, which I am very happy with
Ergotron HX HD monitor arm with patented CF technology (desk, 49")

Zu folgendem Oplite Stand

Oplite GTR Triple Monitor Stand