Yea things need to be locked down. I had 3D printed wind sim brackets for my fans, but after a couple crashes with d-box, they buckled at the weakest joint and I needed a sturdier mount option(admittedly that joint was really thin but removing that part of the mount and no issues since.)
I also have a 3D printed tiny box to hold my remote and the other stick shift handle. They are relatively loosely sitting in it and never have fallen out, which surprises me.
But still, you will need to ensure everything is locked firm. My first day, I didn’t realize the bolts in my wheel rim were a bit loose until testing vibrations caused them to loosen further and rattle in my hands. The haptics can be very powerful shockingly and I can’t even finish the test sweep before reaching to end it due to how insane it shakes.