Safe yes, efficient no. The issue is it may cause the fridge to run longer. The side of the fridge is made of steel, so not a problem as far as safety, etc. Not the best location, but if no other choices, then you do it!

I really like the GE Cafe unit. It seems to have the best features and highest quality!

This unit https://www.cafeappliances.com/appliance/Cafe-30-Smart-Slide-In-Front-Control-Gas-Double-Oven-Range-with-Convection-CGS750P2MS1

Here is the link to the Air Fry cooking modes https://www.cafeappliances.com/smart-appliances/air-fry-tips

Comes in gas or electric.

A lot of this is based on the utilities in the home and the type of cooking you do. If you are doing a standard 30″. then Induction offers a safe, efficient, hi-speed cooking method that is sought out these days. Once you go to 36″ or above. I would push you towards an all-gas with larger sizes, grill/griddle options, and a better price point. Many people opt for a dual fuel range. They like the gas flame on top for control but then go for an electric oven for even heating. I personally use gas and find it to be the best. I like to see the flame and love a gas broiler. In the end, it’s personal preference and a budget that usually dictates it.

Electric: safer, less expensive, easier to clean, priced well in a 30″ size.
Electric Induction: faster response time, better heat control, requires special pans cost-effective 30″.
Gas: better heat control, comes in varying sizes 30″-60″ offers an electric oven on select models, open flame, price.