No, you cannot use it as a tabletop model as a built-in oven should be built into a cabinet as the sides are exposed without any paneling. Therefore, the exposed sides of the oven will be very hot when used.
Oven cooking is by convection i.e. using heating elements to heat up the air in the oven cavity, therefore the food gets cooked from outside in. What temperature you should set depends on the recipes chosen.
Oven cooking is convection cooking which takes some time for your food to be cooked. A microwave oven heats food by passing microwave radiation through it and this wave makes the food cooked from within the outer surface and the cooking time is shorter.
Those ovens having pyrolytic cleaning or catalytic cleaning means that these ovens have a self-cleaning feature. The user does not have to physically clean the oven themselves. In pyrolytic cleaning, the oven heats up to above 500°C and burns off all the stains in the oven cavity to ash. This means that the user only needs to wipe out the ash after the oven has cooled down. In a catalytic oven, you will have 2 panels that you need to install onto the sides of the oven cavity. During catalytic cleaning, which the oven will be heated to the maximum temperature on the control knob and the stains on the 2 panels (right & left) sides of the oven cavity will be burnt to ash but the stains that are on the top and bottom of the oven have to be clean by hand. Hence, a superior cleaning result can be achieved via pyrolytic cleaning Vs catalytic cleaning oven.