Video doorbells: a tower job and a villa job are different trades
In a tower, the problem is permission, not power. The corridor outside your apartment is common area, and a camera pointing into it films your neighbours. Many owners associations and building managements restrict or ban corridor-facing cameras; others allow them if the field of view is angled tightly at your own door. Ask building management in writing before buying anything. Where cameras are refused, a smart peephole camera that replaces the existing viewer from inside the door is usually acceptable, since it captures the same view a resident is already entitled to.
Price accordingly: a straightforward tower doorbell or peephole install is light work and should sit near the bottom of the market range, while a villa install with cabling belongs in the middle. If a vendor quotes villa-complexity money for a tower job, that is a quote worth challenging — comparing two or three vendor ranges side by side in the tamam app makes this kind of mispricing obvious quickly.