If your monitors are not VESA compatible, or in other words, they do not have 4 threaded holes on the back for attaching to a VESA mounting plate please see the below…
1) Your monitors stand may attach to the VESA holes on the back of your monitors so check for this first. Also, do a quick search on your monitor’s model number to verify the specs as VESA mounting will be mentioned in the specs.
2) If it is confirmed that you have no VESA mounting then check out Non-VESA Adaptor Kits on Amazon or whatever online marketplace you have in your country/region. Here is a set available on Amazon.com
3) If you don’t want to spend any dough on adaptors then you can always park your cockpit in front of a shelf or even a desk and just rest your monitors on there instead. The downside of this is you probably cannot get a proper monitor height, which is critical in alleviating any neck strain…..it really depends on your height in comparison to the tabletops height, etc.
Hope this helps!
Best regards,
Chris