Over on the WSGF there is a similar thread, with the Samsung SM2443BW being recommended, which is fortunate as that's what I have.
Am considering buying two more for this pupose (plus active DP adapter of course).
I believe someone over there (WSGF) also already has a 2 x SM2443BW setup.
Whilst the bezels aren't 'ultra' thin, they are on the slimmer side.