It's pretty obvious if the strut mounts need replacement. They look like this or worse.. there should be zero gap.
The only way strut mounts make a knocking noise is if your car is Airbourne enough so the mount will come away from the chassis and then smash back into the chassis when you land. Unlikely.... The cars weight will always keep the mount firmly against the chassis.
Or the more common situation, you reverse diagonally over a curb, the strut mounts will make a knocking noise as one corners wheel lowers while the other one remains static. Either way just do a visual check
With stock suspension and similar height struts you have around 3" travel.
You say you are using coilovers... What is the maximum travel of the suspension? and do you have the height wound all the way up?
Who knows the previous owner may have the lowered the car to the extreme and stuffed them.
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