K8055 - CLAMP usage with K2633

is it necessary to wire the CLAMP of K8055 to the ext. power(+) of relay card? any inductive issues?
otherwise I connected inputs of relay card to digital outputs of K8055 and GND of relay card to GND of K8055. Correct? Thanks.

If the relay card is equipped with suppressor diodes on the coils, then there is no need to connect the clamp.

How would a K2633 relay card equipped with suppressor diodes look like? Where do the suppressor diodes need to be soldered? Thanks.
What could be the impact If I omit the CLAMP wiring and suppressor diodes?

No need to worry, K2633 is equipped with diodes.