Questions about Joby GripTight One Magnetic Impulse

No, you don't have to. It has a slot where you can tilt the ball and otherwise just turn it tight. It sits very tightly, but nothing breaks.

Yes, a portrait photo can be taken in two ways: 1. feet point downwards, the upper part (mobile phone holder) can be tilted 90 degrees in the ball joint at one point. 2. feet point to the side, are attached to a pole, chair back, etc., for example. Then the ball joint does not have to be tilted. In landscape format it is the other way round.

Yes, this is possible. Smartphones with a width of 56 mm to 91 mm are supported.

According to the packaging, it holds smartphones with a width of 56-91mm. In terms of depth, all commercially available smartphones should fit. A GoPro can only be attached if you have a suitable attachment, but I believe there is an extra version for GoPros. The tripod has the same attachment system for attachments or cameras as all normal tripods.

Yes, that shouldn't be a problem.