A:AnswerIt will work with the Canon T7 and extends at least to 5 feet using the elevating head. However, the elevating head becomes unstable the higher it goes, so I wouldn't use that feature much with something like a DSLR on it. Unless you have accidental damage insurance on your camera.
A:AnswerThe phone is mounted sideways, and then the tripod head is rotated as needed. The grip is strong so the phone doesn't fall down when vertical, especially if you have a cellphone cover.
A:AnswerYes, the only thing I would recommend is to not extend the tripod all the way out because although it is sturdy, you would be mounting something that weighs probably double the tripods weight.
A:AnswerI use it with my iPhone X. It would likely work with the iPhone 6S Plus. You would have to try fitting it into the adapter that comes inside the tripod box to be sure. If it doesn’t fit, you can always return it to the store within the return period.
A:AnswerIt would depend if your spotting scope or binoculars has a male bolt on the bottom of the scope of binos. I suggest you bring your scope of binos with you to the store and see if it might work.