Review on 📱 VOLPORT Mount Metal Plate: 6-Pack Metallic Plates for Magnetic Phone Mounts - Adhesive Replacement for iPhone 12 - Rectangle & Round Black Disc Stickers by Lild Zimmerly

They're a bit thinner than the brand I used on my previous phone but they still hold magnetically, no problem. And I weigh a Note 9 with a round rim and don't have any shifting/rotation issues due to the weight. I bought a cheap case to use in the car and the disc is on the outside so can't comment on how well they hold up with the case in front of the magnet. I don't want metal touching the back of my phone, even with a screen protector. Note: I'm pretty sure the glue doesn't differ from one manufacturer to another, and my last one held up well through the Minnesota winter and summer. So a pack of four should be more than enough.