I've spend a long time searching for a solution for non-VESA mounting on google.
Solution 1: Buy a drill and make a few holes. It's too hard for me...plus, my monitor looks slim and I'm terrified of damaging something internally
Soltuion 2: use glue or sellotape. It might look uglily and I'm afraid it wouldn't do the job long term
Solution 3: buy a new monitor with VESA holes.... :(
Solution 4: buy a vesa adapter kit......this is the solution I used
Tools: 1. your monitor; 2. a monitor arm; 3. VESA adapter kit
Steps: 1. remove the stand; 2. connect the adapter kit to the arm; 3. attach the monitor to the adapter kit
Step 1: Remove the Stand
This is easy
Step 2: Connect the Adapter Kit to the Arm
Bought a VESA adapter kit. Check the specifications to make sure if it supports your monitors.
The adapter kit I bought is Loctek DA2. It is compatible with 19" to 27" screen sizes. max. 44 lbs/ 20 kg VESA Mount Adapter (100 X 100 mounting holes)
1. Screw adjustable clamps into fixed plates; Then put anti-slip rubber pads (This step is VERY IMPORTANT！ Your monitor might slip from the kit if you skip this step.)
2. Fit adapter screws through VESA holes on mount
3. Adjust the length of the top and bottom plates to fit the size of the monitor
Step 3: Attach the Monitor to the Adapter Kit
Done!! And be careful NOT use your monitor in portrait mode!!!