I bought this turntable to replace my $15 cake decorating one that has worked good for years. This new one is 21 inches wide and can handle a lot of weight. I put it under this big tree and it turns with just a fingertip of pressure. Very low profile and not wobbly at all. Doesn't lock but I know I will get a lot of use out of it.
https://www.amazon.com/Wood-Very-Espresso-Susan-Turntable/dp/B00SRSXXII
https://www.amazon.com/Wood-Very-Espresso-Susan-Turntable/dp/B00SRSXXII