How to bond metal fire to granite hearth

[Linchpin]

I've just had a new fireplace fitted with a granite hearth. On top of the hearth is a gas burner with metal feet. The gas installer didn't bother to fix it down. The metal feet do have holes in but I really don't want to drill the granite mainly because the holes will be there for ever but also in case the hearth cracks which would be a disaster.
I only need to stop the burner sliding around while the knob is pushed in and turned on.
I'm thinking silicone / mastic as it can always be removed. But wil it hold at all?

 

[r896neo]

Any type of mastic etc that will be easy to get off will probably not hold it, you may have to bite the bullet and put a little araldite on it which will save you drilling it and should hold it but will be hard to get off should you want to.