Carpet Tape
Do you have a rug that slides or just wont lay flat? The above is my actual bedroom rug before I found this Carpet Tape from Amazon for just over $20. Let me tell you not only does this stuff work, it holds for a LONG time! I’m talking at least a year.
I also use on our front door entry rug so it doesn’t slide around. Since I first used - over a year ago - I did have to replace one time. I have pulled up the tape on both hardwood and carpet and it did not leave any damage. Keep in mind though, this stuff is strong so it did pull the rug label off my area rug - BUT better than a wrinkled rug!
I bought the 4” roll and I still have a lifetime supply ;)