A:AnswerI think the 600 series only has 2 HDMI ports, where the 700 series has 3 ports. If you have a cable box, Blu-ray player, Firestick or anything else, you need more than 2 ports.
A:AnswerRocket fish 32"-70" tilted is a great mount it allows you to tilt it up or down. But if you need the tv mount to do more you will need a full motion mount and it cost a little more
A:AnswerUsed existing 32" mount with 8" hole mounting pattern, had to buy the required mounting bolts (less then $6) and slightly modified the holes (drill them out) on the mount. Spacers that were provided were used.