That looks OK but that's not how that tape works! The tape is double sided; it is sticky on both sides. That means that you need to remove the protective plastic with the "3M" printing on it from the tape and use strips of tape
between the back of the power bank and the door frame. In other words, it would be the same as the typical 3M VHB tape that comes on dash cam mounts for attaching to your car's windshield. The way you used it will work but it's messy to remove and you are wasting a lot of expensive 3M VHB tape! It will be a real hassle each time you need to charge the power bank.
Please consider getting some Scotch Fasteners like I mentioned above. It will make your life much easier when you want to charge the power bank each time because it works like Velcro and so you can remove the power bank and then snap it back on.
Also see this document:
"How to use 3M™ VHB™ Tapes".