Smokie, back to your question on identifying the position of studs as, unless I’ve missed it, nobody seems to have replied directly. As you suggest you can tell by knocking the wall but I find that quite tricky. For certainty, after I think I have found the studs, I prod through the plasterboard with a bradawl or similar fine pointed tool to check, trying to keep to places that will be out of sight.
There is a fair chance that the existing fixings are good but you’d be taking a chance on an unknown quantity, especially if they are not into the studs.
If you are drilling new holes remember to check for any cabling within the wall. I speak from experience when I drilled a hole in a new house above a cabinet completely forgetting there was a socket behind it. I reckon I missed the cable by about an inch.
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