The smaller the better I’ve found, less heat loss and more reliable, we use a 1-2 person air fryer. They do fabby roast potatoes with almost no mess.
Another recent thing I’ve got is a microwave pan, you can get ridged or non ridged versions
6 mins in the microwave with some sausages, turn them, then 5 minutes more. No oil etc needed. Sausage sandwiches for lunch, easy to clean.
caveat on the microwave pan, get a good one, the “paint” coating needs to be 100% perfect or you will get arcing from exposed metal