I have a portable small oven with a max temperature of 250°C.  There are two hot bars, one at the top and the other at the bottom.  First of all, I'm not sure that I can get good pizza in that.  My crust never gets heated much, it looks like the base is not heated when it's on the plate.  So I want to ask if it's possible to get a good pizza at 250°C. 
There are a large variety of pizza types and styles, with different doughs, crusts, and toppings.  While it is difficult to make a VPN napolotana style pizza without a wood fired oven, there are a myriad other types of pizza.  Many of these in fact work quite well in home style ovens, and even toaster or portable ovens.  See the Food Lab's article on Three Doughs To Know, which describes three different types of pizza dough (from the many).  The Sicilian style pizza works extremely well in a toaster oven. 