So I used the heaviest duty command strips and I used four on each one and they are working well so far. The backs on these are open though so I had to attach them to a wood piece and then use the command strips on the wood. But it looks really cute!
They are pretty sturdy and the brackets screw into the wall but we are holding ukes and an acoustic. The electric stays in its case.
Yes, the individual arms do. They can be moved to handle a variety of fretboard sizes. I have a soprano and tenor ukulele and a banjolele hanging on my wall with them. They all have a different width fretboards and the banjolele is also fairly heavy. Never had a problem with any of them fitting or supporting the weight.
These wall hangers look awesome and hold my guitars securely. But, beware of the cheap hardware and wall anchors included with the purchase. …So if you are prepared with your own quality wall anchors and screws and these will serve you great.
Yes, it comes with the screws to mou by in the wall.