I have the same fridge and have built it into a kitchen pod that I made. In order to hold it securely I have used the handle recesses and carved 2 blocks of wood to fit in the recesses. These are then held in place using a webbing strap all the way round the fridge.
In my case the fridge is then part of the whole pod arrangement. For you I would suggest incorporating some eye bolts/rings into the wood filling the handle recesses, could then use another strap to fix to the floor rails.
View attachment 125768View attachment 125768View attachment 125769View attachment 125770View attachment 125771
(Doubt Araldite would be strong enough to take the loads involved)