It is always better to have a dedicated power supply if you have the circuit space on your electrical panel. With dedicated circuits, there are no other devices on the circuit to contaminate the circuit with noise. Also, power for the HT equipment is not being sucked away by other apppliances or devices on the same circuit.
If you have a full blown HT set-up, it would be better to have two or three dedicated circuits. If possible, keep your analog and digital equipment on different circuits. If possible, give power amps their own circuit. If possible, use 20 amp circuits rather than 15 amps circuits. This is a wish list and you may not be able to do all of these things. But to the extent that you can, it will help things.
With respect to a hard wired power conditioner/surge protector, your electrican can install a "whole house" surge protector onto your electrical panel. These things are becoming more common. It isn't a hard thing to do although they can be a bit expensive, a few hundred dollars anyway. The alternative is to use individual, component power conditioners between your equipment and the electrical outlet. These are not hard-wired.
Keep in mind that your electrician may not be an audiophile and may think that you're crazy. You can take comfort in our company. Most of us will not say that you're crazy since we do these things too.