If you are willing to drive to southern NH, I recommend Boomer Nashua (5 Executive Park Dr, Merrimack, NH 03054
https://www.nh-car-audio.com/). They've been in business for over 20 years, and they have supplied components and/or performed custom audio installations on 12 vehicles for my extended family, and counting. They are not cheap, and they won't haggle with you on price, or price compete with other audio supplier/installer competitors. But, they sell high end audio components, they are fair, they perform outstanding out-of-the-box and custom work, and they warranty their installation work for the life of your vehicle.
Sure, I could perform the work myself, and it is fairly easy to perform this work on these vehicles, as AD stated above. I did all of my own audio system work in my younger years, but at this point in my life, I have other more pressing priorities for my available time.
Based on the above description and business model, if you decide to have a conversation with Boomer Nashua, specifically ask for Jamie, the owner, and feel free to use my name as a reference.