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Heh, I don't have room or budget for another kitchen gadget. But the temptation is strong.
The current oven cabinet has base and head vents, with space at the back. So it looks as-expected. But there's still some heat comes out of the door, especially when open but also when closed. Maybe the door seals aren't great... but also, this is with the oven fan on, so the hot air has to go somewhere.
Buy an air fryer, you'll virtually stop using your oven. Problem solved.
Although I suspect if your oven is really heating up the fridge it's due to bad ventilation somewhere.