I have a similar (smaller, judging by the picture) version of the Linhof pan-tilt head. On mine, the attachment screw rides in a channel so you can shift the camera back and forth a bit for a better placement. I'd suggest not buying any more gear before you have the camera actually at hand to measure, get a feel of the weight and size etc.
Also, you haven't told us anything about how you intend to use the 5x7. For example, if your thing is studio portraits then what you really want is a nice sturdy studio stand. If you work on location but usually near the car and/or have an assistant, a big classic metal or wooden tripod would work nicely. If you want to backpack considerable distances, a modern carbon fiber design might be a better idea.
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