Quick-Mounting a removable panel (positional Guns) on top of my CP?

[Endprodukt]

I went through several ideas but I hope someone comes with something fast and reliable.

I want to build a positional gun panel that I put on top of my control panel, which looks like that:

https://www.dropbox.com/s/il2mxn7qb1n1fkx/2016-05-02%2021.58.16.jpg?dl=0

As you can see I have enough space to built it high enough to cover the joysticks, so they're not in the way and I didn't plan on using on bottom panel.

My first idea was to use rubber feet but I'm not sure they're enough and the guns/panel are heavy enough to make it rest. Also, the guns have solenoid recoil which is another factor to consider.
I was hoping to find some kind of easy to use push-in system that I could use to fix it on top of the CP. Couldn't find anything that looks like it would be easy and quick.
Some kind of attachable screw clamps would be another idea, as the CP has a gap on the front (much like wheels that can be fixed to the table this way) but couldn't find something that would work the way I imagine it.

What would you guys do!?