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This 3/4 in. Brass PEX Barb x Barb Ball Valve will be my main shut off valve in my house. It will be in an interior wall behind a wall panel.
How can I secure this valve within the wall so it doesn't move around when the valve is turned on & off?
Generally you would just secure the PEX with some pipe clams near the valve and that would be good enough. The valve just hangs there in mine and I usually grab a pipe with one hand when I turn it.
You can use a "drop-ear" valve, which would look like this:
The "ears" are meant for mounting the valve with screws.
Required, but never shown