Built-under double oven fitting

I have a built under double oven that needs replacing. The current oven is an Indesit that sits on feet and is not screwed in to the counters in any way. The models I am looking at do not come with feet and instead sit on brackets that are mounted to the cabinets either side.
My problem is that to the left of the oven is the dishwasher and therefore there is nothing the bracket can be screwed into. Can someone recommend the best way to fit an oven into this space?
Was thinking it might be...

Built-under double oven fitting