Does having a first MoT performed early fix that as the date for the next MoT?

Does having a first MoT performed early fix that as the date? Or is it okay if done within a month of the due date?

My car is due for its first MoT - do I need to take it to a dealership or can I take it to my local garage without invalidating the warranty?

My Kia Carens is due for its first MoT. Do I need to take it to a Kia dealership or can I take it to my local garage without invalidating the warranty?

When do I have to get my car MoT'd in order to preserve the 12 months?

My car is coming up to 3 years old and I recently received a notification of this from the DVSA which said I would need to MoT the car by June 30th. I checked with a local garage how soon before the due...