I only have one and no, it sits in the window and the back half is propped up with concrete blocks on the outside of the house.
Thats actually how i found my uncle passed away from a heart attack. We hadnt seen him in 5-6 days and He had his door locked and the blinds pulled but his vehicles were home so finally i pushed the ac unit in and found him dead on the couch, his face was eggplant purple smdh. One of those things thats hard to forget, esp since he was only 54.
Im not even sure i know what window unit braces look like tbh or if ive ever seen one.