I don't know enough about drywall to answer your question. I'm sure others with more experience will be able to do so.

But, should mounting between the studs prove to be unfeasible, one thing you might consider is mounting a nicely finished piece of wood between the two studs, firmly affixed, at each end, to the studs. Then you would have a secure platform to which the VP100 can be mounted. The VP100 itself would shield the wood, for the most part, from view.

Jack

"People generally quarrel because they cannot argue." - G. K. Chesterton