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The special definition of "balcony solar" is that it avoids most of those requirements. It seems this is usually done by adding a clamp meter to the input to the house, which sends a control signal to the panel inverter over Wifi to reduce output if it would be feeding back.

(this is country dependent)

You have to register to the utility, but that's just a form to fill with the model and power of the kit.

With a e-meter, you will get compensated when you're generating a surplus (+/- €0.04/kWh last time I checked).

However, thanks to the battery, I'm self-consuming almost all that electricity, saving around €0.30/kWh.

Expect 800kWh of annual production per 1kW of panels.

My guess as a Dutch guy, not 100% familiar with our neighboring country's rules etc): Yes, exporting to the grids. If a house has an old Ferraris meter, it will rotate backwards or a new, smart(er) meter, that has a separate counter for delivery back to the grid.