I have the same false bottom as the OP, I bought it from my LHBS but it came with a rigid SS pickup tube compression fittings and elbows that go from the ball valve to the false bottom.

I was having trouble getting a siphon from below the false bottom. The pickup tube elbow connection to the false bottom is the problem area. My elbow at the FB is threaded and goes just below the FB. There is a nut that is used to apply pressure, but not actually attach to the FB. I got it right and had great suction from the slots, it is not perminataly mounted and I can remove it easily for cleaning and drying.
I and the OP could mount it permanent-ly but do folks actually just leave the false bottom in all the time?