I've already asked you what kind of clips but the bottom line is that if you don't provide more information about the type of tonneau that you're considering then you won't get any responses, or you'll get rubbish as has already happened.
Some tonneau systems will work on tubs with over rail liners, some won't. People need to know exactly what system, preferably with photos or links. They also need to know what kind of liner you have, drop in or sprayed on.
If work is so terrific, why do they have to pay us to do it?