Its all about vibration
Anyone that has attached a camera to a multi rotor will understand the frustration of jello. Its seams so simple that you would expect it to have a simple solution, but it isn't. The reason is resonance and the resonating frequencies that match your aircraft.
Just putting the camera on or under those rubber bulbs, will not likely have much effects. That's because the mass of the camera is too small to separate it self from the overall frequency of the model.
There are two approaches
The real secret is to reduce and separate the vibration, and add mass to the camera module. Reducing vibration is straight forward, just balance the propellers and motors.
Spinning the motors without propellers will give you an idea if balancing motors is necessary. If the frame vibrates you need to look at this.
The camera should be on some kind of structure, along with the battery. The structure needs to be flexibly connected to the flight module. If you have an RTF or ARF aircraft, this may not be possible. . In this example David suspends his battery and camera on wire hoops, from the body of the air frame. The mass of the battery dampens any vibration from the props and motors.
Everyone needs a prop balancer suited to their kind of propellers.
Two methods of balancing propellers are , the cellar-tape method and the sanding method. Both work well but the tape method is quick and easy.
Mount the camera from the back or top and bottom. If the camera can flop about it will display jello from the smallest vibration.
Don't think jello is unavoidable, it can always be fixed.