Review title is Easy to install on any 90* angle [SEP] These didn’t come with instructions, so when I took one apart to add catnip, it was difficult for me to figure out.  Then I noticed a small notch on one of the pointed ends & was able to get it back together.  The adhesive double sided tape seems very strong.  My cats were immediately curious about them & one has already rubbed against one.  I call that a success!  I will say that the catnip is very messy….but again there were no instructions, so I am not 100% sure I’ve installed correctly.