Lenovo ThinkVision E28u-20 28" 4K HDR Monitor - Manual (Page 25)

Step 4: Install the assembly bracket for the VESA compatible wall mount. (100mm x
100mm distance), VESA assembly screws M4 x 10 mm.
Step 5: Mount the LCD to the wall following the instructions for the wall mount.
Only the lightest weight/weight-bearing wall mount from the UL list should be used:
8kg
Note: When using the flexible arm, the display should not be tilted downward by
more than 5 degrees.
Chapter 2. Adjusting and Using the Display 2-9