How would you remove the central air vent dials?

[Donut]

Hello,

I am currently using a paper clip to clamp my GPS onto the central air vent around the emergency flashers. Now, I would like to totally remove the left vent and eventually mount the GPS in a better fashion.

Would anybody know how to remove the vents gracefully?

Note: I've used the suction cup on the central flat console, but the suction is not as great anymore and the GPS tips over frequently.

Below is a pic with the vents encircled.



thx for your insights!