Page 5 of this should get you an idea.

Selecting a similar size (in “freedom units”), a #6x2” is listed as having a shear strength of 265lbs. That’s about 120kg…

But just to be clear, you’re basically talking about 3kg per clip, and .75kg per screw, pretty sure you’ll be OK.

It’s not clear how the screws are mounted, if they are parallel to the tile, then you’re talking about shear strength, if they are perpendicular, you’re talking about tensile strength (and really, more concerned with “ultimate pull out load”).

But in either case, as long as you’re screwing in to something solid like a joist or stud, I wouldn’t worry about the screws.