Since I couldn't find a triple screen stand that fits my purposes and which is also affordable I went on to look for other solutions.
I hate if light shines through the gaps between the bezels, so I tried to attach the screens using tape. This didn't work out really well, the tape did not hold for long (no surprise on warm surfaces) so I decided to go another way.
I temporarely taped them really hard and then pressed hot glue into the gap from the rear. Worked like a charm and within a minute, the three screens were attached so firmly that the gap between them is not even 1mm (and remained so ever since) and if you move them gently on one edge the entire setup shakes like it is one piece. Really cool! :D
I put some black tape over the gap on the rear and now it also looks like one surface.
What was at first intended to be a temporary solution now really seems to turn into a permanent one.
Hope this helps anybody trying to put together what refuses to ;)
angles:
20 degrees between displays,
also tilted about 5 degrees which is where the hot glue comes into play :)