Command 20 lbs. to 15 lbs. to 5 lbs. White Picture Hanging Strip (32-Pack) (16 X-Large Pairs, 12 Large Pairs, 4 Medium Pairs) 17218-16ES - The Home Depot
Command Strips : the baby-proofing tool you didn't know you needed — Another Blonde Blog
Damage-free removal with 3M command strips! I have a whole gallery wall like this. : r/Wellthatsucks