Bought used with 53K miles excelllent condition. Has new over the rail bedliner....I want to attach tiedowns but not sure how to do it because the bedliner is covering the rails. What is the best way to do this?

I want to know the best way to attach tiedowns to the rails of the truck bed.  The bedliner covers the rails and I can't see, and don't even know, if it has stake pockets or not.  I might want to put a tonneau cover on later and would need something that wouldn't interfere with that.
Is there a way to do this without drilling, and can I even do it since the rails are covered?????  
Signed "Dummy"