Covers for rack settings so they don't get bumped?

Any suggestions on this? I can't seem to find it anywhere. I imagine a 1u clear plastic cover that's very easily removable to keep knobs from being bumped.

Also thoughts on power conditioners that are more than glorified power strips?
 
D'darrio makes a Loknob to lock down guitar pedal knobs, so you could feasibly do that but does require more clearance from the rack face. You could always check where the output settings are in the utility menu so the output knob(s) is always at a specific percentage
 
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