For the wall mount of this 55" OLED TV, you need a mount that is VESA-compatible and can support the weight of around 13.4 kg. The exact VESA dimensions are not explicitly stated in the data provided, but VESA dimensions such as 200x200 mm or 300x300 mm are common for 55" OLED models from Samsung.
A common, stable wall mount with VESA support and sufficient load capacity (at least 15 kg) is recommended. Make sure that the mount is suitable for OLED TVs and supports a screen diagonal of 55 inches.
As no specific wall mount is mentioned in the data material, it is advisable to check the VESA standard of the device in the manual or on the Samsung website and select a suitable mount with these dimensions.