I've enjoyed "nano tape", thick clear stuff you can find on aliexpress or amazon. It's like a step up from mounting putty. Good for stuff like sticking a powerstrip to a desk or wall without drilling holes and using screws. I've also used a piece with the top part covered just to add a little bump to my bathroom vanity to stop a fan I'd set there from falling on the floor. It's pretty strong stuff, so beware using it on paint/drywall as it can rip that off later if removed. Works great on smooth/hard surfaces. There is probably some function overlap with 3M VHB tape, but I found this stuff first and still have a big roll. Plus it looks cool.