Runway101
I didn't have a problem reaching all the controls (perhaps I have a long left arm - aka a fiddler crab). I lean forward and reach over the collective bar. I've seen others mount 530's etc. here on a cross bar.
Wrt mount - it's permanent - bolted through the console with added internal bracing. The bottom left tip attached to the side of the console with some velcro to damp the vibrations at low RPM (during startup).
For rentals, I'd use the knee mount.