I use the heavy gauge Klingon top protectors, and they do work and are easy to use. However, the ones I purchased are not as wide as I would have liked, so I had to be very careful about placing them. When I first put them on I did not do such a careful job and ended up with some nail marks in the top. Hopefully the newer ones are wider. You might also consider going to a plastics store and see if there is something similar that can be bought in sheet form and then cut to the appropriate dimensions.
P de V