They do need glue
I’ll still give it 5 stars even though they do t come with adhesive on the back of them.  I use a strong adhesive glue and nailed them also. I read somewhere here that the nails didn’t go in cause of the smaller hole outline, It worked for me, I just used a narrow tap on of the nail that didn’t go all the way. I guess I’m a little more creative(common sense). And they have lasted. When one pair wears down, I’ll repeat the process.
Rating: 5 stars