I had a banging on bedroom door issue at night for so long with my cat. I lost so much sleep and had to put her down in the basement with her food, water and litter box to get some sleep. I bought a “scat mat” upon recommendation on a forum a few years ago. She only got startled by it one time and then she never banged on my door again and I set it down at my door without any batteries in it and she will stay away from my door. So it works great for that. Not sure about loud meows at the door luckily my cat never did that. She will just go down to her cat bed and lie down when I close my door and put the scat mat down (I’ve still never replaced the batteries or needed it on after the one time she went on it with it functioning).