Works like a charm! Much better than my previous setup (the bed was clamped onto a plexiglass frame - original Folger Tech. Kossel setup...). Very, VERY stable now.
PS: I used M4 screws instead of M3 to fix it to the aluminium extrusion.
Folger Tech. Kossel 2020 Rev.B
0.40 nozzle, 0.25 mm layer height
Prints like a charm. No specialities.