Aye, if I go built in I can have whatever, but that means refitting the entire kitchen. I want to slot something freestanding into an existing gap
Might be worth a google around cookers for caravans/motorhomes.
My static has a standard 60cm cooker, but there are plenty that don't.
I've seen some odd specs such as three burners, and mixed burners - two gas and one electric.
I've not seen any induction hobs, but someone might be making one.
Some of the makes of caravan specfic cookers are not well-known, but I imagine they are not much different in quality to the big names.