Our proposed UR5e nest touches the mounting bracket on both sides and underneath. Bench samples rock between contacts, but a firm clamp makes them look settled. I don't want a bigger clamp to become the answer before we know which contacts are meant to locate the part.
Drawing doesn't distinguish them. I've asked the designer to mark that and compare the actual samples before changing clamping. One wider sample seems to bridge the side contacts; needs measuring, not my thumb test.