9 inches tall when not deployed. however, depending on the angle of the legs when deployed around 6-7 inches or less.

I've checked mine and it appears if your Mefoto head has a 1/4 socket, it will work. However, if it has a 5/16 socket, it will still work but you'll need an adapter.

I use the Grip Tight Mount with my two IPhone 6S's. The phone is secure, no movement, and it makes the Gorillapod a complete device for video.

Hi,This is as sturdy as it gets, I think it would hold anything. I personally got it because I thought that my video card was so heavy that it would not hold its on weight and I thought I would give it a bit of support. This thing would bend in any which way I wanted it, and then it would hold the weight. Interestingly it turned out, that if the card was not hanging loose then the contact would not be good so I took it out, but I think it is a great piece. I have a canon 2D and a 300 zoom guessing that weight I would say that it certainly would hold it in some positions. I see no reason why you would want to stretch the legs so wide that it may collapse.

I find the Joby Ball Head for Gorillapod SLR-Zoom perfect for this application. It has a quick release, bubble level and swivels easily to adjust once your pod is in place.

I have a Canon Rebel T3i and it can screw right on the tripod. I believe that it comes with two different sizes, but not 100% sure about that. Works wonderfully!

The Red/Black version has been discontinued.

Yes you can. The head and tripod have the same sized connecting thread.