the warranty issue is a tough one for me too. I'm looking to put into a wall and can't use one of their stands. I'm a little nervous to spend $3k and void the warranty right off the bat, but I'm not sure any other builders would honor their warranty if I have a stand built by my contractor.
Looking forward to following along.
After working with them, I think they understand situations like yours with built-ins. Maybe you could get their stand and conceal it behind the wall, or do you have something already built in? Also just ask them. They maybe able to work with you if you send them photos and information about for setup. They were really great to work with.